Allergy & Immunology Billing — Testing, Immunotherapy, Biologics & Every Complex Claim Paid
Allergy and immunology billing combines high-volume allergy testing with immunotherapy administration billing, biologic therapy for severe asthma and chronic urticaria, and a procedural code set that changes reimbursement based on the number of tests performed, the testing method used, and the immunotherapy injection protocol followed. Netix handles every layer so your allergists focus on patients while we make sure every allergy service gets paid correctly.
Allergy testing code selection by method and count
Immunotherapy single vs multiple injection billing
Biologic asthma & urticaria billing specialists
THE PROBLEM
Why Allergy & Immunology Practices Lose Revenue Across Every Service Category
Allergy billing errors are systematic and high-volume — they happen on every testing day, every immunotherapy injection visit, and every biologic administration encounter. Here is where the losses happen most consistently
Allergy testing code selection is the most method-dependent billing in all of medicine.
Allergy testing codes are selected based on testing method — percutaneous (scratch/prick), intradermal, patch testing, photo patch testing, and in-vitro testing — and the number of tests performed. Percutaneous tests use different codes than intradermal tests. The number of allergens tested determines whether a per-test code or an evaluation code applies. Most allergy practices either apply a single testing code regardless of method, miscount the number of tests performed, or mix percutaneous and intradermal codes incorrectly — creating systematic billing errors on every testing day.
Immunotherapy injection billing is wrong in most allergy practices.
Allergen immunotherapy codes (95115–95117) are selected based on whether a single injection or multiple injections are administered at a single encounter. 95115 covers a single injection; 95117 covers two or more injections. When a patient receives injections from two separate vials in a single visit — which most immunotherapy patients do — 95117 applies. Most allergy practices either bill 95115 × 2 (incorrect — 95117 is the correct code for multiple injections) or bill only 95115 for a two-injection visit, losing the correct reimbursement on every immunotherapy encounter.
Allergy serum preparation billing is almost universally missed.
The preparation of allergen antigen (allergy serum) is separately billable — 95145–95170 for single and multi-dose vials by allergen type and number of doses. Most allergy practices bill only the injection administration codes and miss the antigen preparation codes entirely. On practices preparing serum for hundreds of immunotherapy patients, the missed antigen preparation billing represents significant monthly lost revenue.
Biologic therapy for severe asthma and chronic urticaria is two-component and routinely incomplete.
Dupilumab, omalizumab, mepolizumab, benralizumab, and tezepelumab for severe asthma — and omalizumab for chronic idiopathic urticaria — require administration billing plus drug supply J-code billing plus prior authorization. Most allergy practices either miss drug supply billing, apply the wrong J-code, or fail to document the required biomarker evidence for auth submission.
Challenge testing and provocation testing billing is routinely missed or incorrectly coded.
Oral food challenge (95076–95079), drug challenge, bronchial provocation testing (94070) — these time-based testing services are separately billable and are either not billed at all or incorrectly coded as E&M visits. Food challenge testing in particular represents significant separately billable time that most allergy practices bundle into the office visit.
Patch testing billing is the most consistently underbilled diagnostic service in allergy.
Patch testing (95044 per patch) for contact dermatitis — number of patches placed determines total reimbursement. Most allergy practices either bill a single patch testing code regardless of how many allergens are tested or apply the wrong code for the testing method used. On a comprehensive patch test panel of 36–80 allergens, the revenue difference between correct and incorrect coding is significant.
OUR ALLERGY & IMMUNOLOGY BILLING SERVICES
What Netix Handles for Allergy & Immunology Practices
Allergy Skin Testing Billing
Correct code selection across all allergy testing methods — percutaneous scratch or prick testing (95004 per test), intradermal testing (95024 without evaluation, 95028 with sequential evaluation, 95017 venom testing) — with test count documentation verification and correct code family applied per testing method used on every testing encounter.
Patch Testing Billing
Contact dermatitis patch testing (95044 per patch applied and read) — per-patch billing with correct count documentation, reading interpretation separately documented, and prior auth where required for extended panels. Correct distinction between patch testing (contact allergy) and percutaneous allergy skin testing (IgE-mediated allergy).
Allergen Immunotherapy Injection Billing
Single allergen immunotherapy injection (95115), two or more allergen injections same encounter (95117) — correct code applied based on number of injections administered, with documentation of allergens injected, doses administered, and observation period documented to support the service billed.
Allergen Antigen Preparation Billing
Single dose vial antigen preparation (95145–95149 by allergen type), multi-dose vial antigen preparation (95165 per dose), professional services for antigen supervision and testing (95170) — identified and billed on every qualifying serum preparation encounter, turning an underutilized revenue source into a consistent monthly stream.
Oral Food Challenge Testing Billing
Oral food challenge (95076 for first 120 minutes, 95079 each additional 60 minutes) — time-based billing with correct time documentation, correct first vs add-on hour code selection, and physician supervision documentation that supports the separately billable service.
Rush Immunotherapy Billing
Rapid desensitization or rush immunotherapy with multiple sequential injections — correct code selection for the accelerated protocol, physician presence documentation, and monitoring time billing where separately payable.
Biologic Asthma Therapy Billing
Dupilumab (J0173), mepolizumab (J2182), benralizumab (J0517), omalizumab (J2357 for asthma), tezepelumab (J0222) — administration (96372) plus drug supply J-code per unit on every office-administered biologic injection, with biomarker-specific auth submission documentation prepared according to each biologic and payer.
Chronic Urticaria Biologic Billing
Omalizumab (J2357) for chronic idiopathic urticaria — administration plus drug supply billing, prior auth with chronic urticaria diagnosis documentation, duration of disease and prior antihistamine failure documentation for step therapy compliance.
Primary Immunodeficiency Infusion Billing
IVIG for primary immunodeficiency disorders (96365–96368 for IV administration, 96369 for subcutaneous, plus J1459 per gram for IVIG) — two-component billing with prior auth, diagnosis documentation, IgG trough level documentation, and correct subcutaneous vs IV administration code selection.
Spirometry & Pulmonary Function Testing
Spirometry (94010), before and after bronchodilator (94060) — commonly performed in allergy practices for asthma evaluation, billed correctly as a separate service from the E&M with correct technical vs professional component application.
E&M Level Optimization
MDM-based E&M review for allergy — complex allergic disease management, primary immunodeficiency, severe asthma with biologic therapy, and hereditary angioedema management routinely support 99215. Systematic undercoding at 99213 or 99214 compounds across every patient visit.
Prior Authorization Management
Biologic asthma therapy auth with biomarker documentation, IVIG for primary immunodeficiency with IgG level evidence, oral food challenge auth, rush immunotherapy auth, and extended patch test panel auth — complete documentation packages per payer per service.
Denial Management — Allergy Specific
Allergy testing method disputes, immunotherapy injection code selection challenges, antigen preparation billing denials, biologic drug supply denials, food challenge medical necessity denials, and IVIG coverage denials — appealed with allergy-specific clinical documentation and testing reports.
ALLERGY TESTING BILLING EXPLAINED
Allergy Testing Billing — Method, Count & Code Selection Rules
Allergy testing billing is the most method-specific billing in outpatient medicine — the same allergen tested by a different method produces a completely different CPT code with different reimbursement.
Percutaneous testing (scratch or prick):
95004: Percutaneous tests (scratch, puncture, prick) with immediate reaction reading, per test
Each allergen tested percutaneously is one unit of 95004. A 40-allergen prick test panel = 40 units of 95004. The documentation must list each allergen tested individually — a note saying “standard environmental panel” without specific allergens listed does not support per-test billing.
Intradermal testing:
95024: Intradermal tests, allergen extract, with or without evaluation, immediate type reaction
95028: Intradermal tests, allergen extract, delayed type reaction, with readings after 24 hours
Each allergen tested intradermally is one unit of the appropriate intradermal code. Intradermal codes reimburse differently than percutaneous codes — and the method must be documented to support the code billed.
Sequential intradermal testing (SET):
95017: Allergy tests, venom testing — specific to venom (bee, wasp, yellow jacket) intradermal testing
The critical distinction:
Percutaneous and intradermal tests cannot be interchanged — billing percutaneous codes for intradermal testing (or vice versa) is a coding error regardless of whether the reimbursement difference favors the practice. The documentation must support the method billed.
Comprehensive allergy evaluation:
When a comprehensive allergy evaluation is performed (history, physical examination focused on allergic disease, review of testing results, development of treatment plan), this is billed as an E&M service (99202–99215) in addition to the testing codes. The E&M is separately billable with modifier 25 when a significant separately identifiable evaluation is performed on the same day as testing.
In-vitro testing (blood tests):
Allergen-specific IgE testing (86003 per allergen, 86005 for qualitative screening) — in-vitro testing billed per allergen tested, with lab billing separate from physician billing for interpretation.
What we handle:
Method verification on every allergy testing claim, per-test unit count verification against documented allergen list, correct code family selection per testing method, and E&M modifier 25 applied when a qualifying evaluation accompanies the testing.
IMMUNOTHERAPY BILLING EXPLAINED
Allergen Immunotherapy Billing — Injections, Antigen Preparation & What Is Consistently Missed
Allergen immunotherapy is a multi-component billing opportunity — and most allergy practices capture only one component while missing the others.
Component 1 — Injection administration:
95115: Professional services for allergen immunotherapy not including provision of allergenic extracts — single injection per visit 95117: Professional services for allergen immunotherapy not including provision of allergenic extracts — two or more injections per visit
The most common error:
Billing 95115 × 2 for a visit where two allergen injections were administered. 95115 is for a single injection — when two or more injections are given in one visit, 95117 is the correct single code. Billing 95115 twice instead of 95117 once creates an incorrect duplicate billing pattern.
Component 2 — Antigen preparation (most missed):
95145: Professional services for the supervision of preparation and provision of antigens for allergen immunotherapy — single dose vials, per each stinging insect (up to 5) 95146: Single dose vials — two stinging insects (up to 10) 95147–95149: Single dose vials — three through five stinging insects 95165: Professional services — multiple dose vials per dose (inhalant allergens)
95165 is the highest-volume and most missed antigen billing code in allergy.
Every multi-dose vial prepared for a patient's immunotherapy represents separately billable antigen preparation services under 95165 — billed per dose in the vial. A multi-dose vial containing 15 doses = 15 units of 95165. Most allergy practices prepare vials for dozens of immunotherapy patients monthly and bill zero units of 95165.
Component 3 — Rapid desensitization:
When rush or cluster immunotherapy is performed with multiple sequential injections in an accelerated protocol, the injection billing reflects the number of injections administered at each session, and physician presence/monitoring documentation supports the billing.
What we do
Three-component billing review on every immunotherapy encounter — injection code verification (95115 vs 95117 based on injection count), antigen preparation billing identification (95165 per dose for multi-dose vials), and documentation review confirming the allergens, doses, and observation period.
ALLERGY & IMMUNOLOGY CPT CODES WE KNOW COLD
Allergy & Immunology CPT Codes — Handled by Specialists
| CPT Code | Service | Common Issue |
|---|---|---|
| 95004 | Percutaneous allergy tests per test | Test count not documented per allergen |
| 95024 | Intradermal tests immediate | Percutaneous codes billed instead |
| 95028 | Intradermal tests delayed | Method documentation missing |
| 95017 | Venom intradermal testing | Wrong code for venom testing |
| 95044 | Patch tests per patch | Per-patch count not documented |
| 95115 | Immunotherapy single injection | Billed twice instead of 95117 |
| 95117 | Immunotherapy 2+ injections | 95115 × 2 billed incorrectly |
| 95145–95149 | Antigen single dose vial stinging | Almost universally missed |
| 95165 | Antigen multi-dose vials per dose | Most missed code in allergy billing |
| 95076 | Oral food challenge first 120 min | Bundled into E&M — revenue lost |
| 95079 | Oral food challenge add-on 60 min | Add-on time not billed |
| 96365 | IVIG infusion first hour | Drug supply J-code missed |
| J1459 | IVIG per gram | Per-gram calculation errors |
| J2357 | Omalizumab per 5mg asthma/urticaria | Wrong J-code per indication |
| J2182 | Mepolizumab per 1mg | Biomarker auth documentation |
| J0517 | Benralizumab per 1mg | Step therapy documentation |
| J0173 | Dupilumab per 200mg | Per-unit calculation errors |
| J0222 | Tezepelumab per 1mg | Newest biologic — code awareness |
| 94010 | Spirometry | TC/26 application errors |
| 94060 | Spirometry before/after bronchodilator | Unbundling of pre/post separately |
| 86003 | Allergen specific IgE per allergen | Per-allergen count documentation |
| 99202–99215 | Office E&M visits | Systematic 99213 undercoding |
| 96372 | Biologic injection SC/IM | Drug supply J-code missed |
PRIMARY IMMUNODEFICIENCY BILLING
Primary Immunodeficiency & IVIG Billing — High-Value, High-Documentation
Primary immunodeficiency diseases — common variable immunodeficiency (CVID), X-linked agammaglobulinemia (XLA), selective IgA deficiency, and combined immunodeficiency disorders — require immunoglobulin replacement therapy that is among the highest-value recurring services in allergy and immunology.
Two routes of immunoglobulin administration:
Intravenous IVIG:
Administration: 96365 (first hour), 96366 (each additional hour)
Drug supply: J1459 per gram of IVIG
Prior auth: Required from virtually every commercial payer with IgG trough level documentation confirming deficiency and supporting dose
Subcutaneous SCIG:
Administration: 96369 (subcutaneous infusion first hour), 96370 (each additional hour)
Drug supply: J1562 (immune globulin SC per 500mg) or product-specific J-codes
Prior auth: Similar to IVIG with IgG trough level documentation
Per-gram J-code billing:
IVIG J1459 is billed per gram — a patient receiving 40g IVIG = 40 units of J1459. Per-gram calculation errors (billing per vial instead of per gram, or using incorrect gram weight) create either underbilling or compliance exposure on every infusion.
Prior auth documentation for IVIG:
IgG trough level below normal range (typically < 600mg/dL) confirming quantitative immunodeficiency, specific diagnosis code, documentation of recurrent infections or clinical manifestations of immunodeficiency, and dose justification based on weight-based dosing (typically 400–600mg/kg). Most commercial payers require auth renewal every 6–12 months with repeat IgG trough levels.
Waste billing:
IVIG comes in multiple vial sizes — 2.5g, 5g, 10g, 20g, 25g vials. When partial vials are used and the remainder is discarded, waste billing with modifier JW recovers the full vial cost rather than only the administered portion.
What we do:
IV vs SC route administration code selection, per-gram J-code calculation based on documented dose, prior auth with IgG trough level documentation, waste billing with JW modifier, and IVIG-specific denial management when payers dispute dose or frequency.
Who We Serve
Allergy & Immunology Providers We Work With
General allergy practices
Allergy testing billing, immunotherapy administration and antigen preparation billing, and E&M optimization
Severe asthma specialty practices
Biologic therapy billing, biomarker auth documentation, and complex asthma E&M coding
Food allergy practices
Oral food challenge billing, food desensitization billing, and epinephrine auto-injector prescription management
Primary immunodeficiency practices
IVIG and SCIG infusion billing, per-gram J-code calculations, and auth renewal management
Contact dermatitis practices
Patch testing billing, extended panel per-patch coding, and dermatology-allergy combined billing
Venom immunotherapy practices
Venom testing (95017) and venom immunotherapy antigen preparation billing
Pediatric allergy practices
Pediatric allergy testing billing, Medicaid coverage rules for immunotherapy, and food allergy management billing
Academic allergy programs
Teaching physician rules, clinical trial billing separation, and research billing compliance
RESULTS WE BUILD TOWARD
What Allergy & Immunology Billing Looks Like When It Works
First-pass clean claim rate: 96%+
Days in AR: under 30
Allergy testing code accuracy: 100% — method-specific code with per-test count documentation
Immunotherapy injection billing: 95117 applied correctly on all multi-injection visits
Antigen preparation billing: 95165 billed on every qualifying multi-dose vial preparation
Biologic drug supply capture: 100% — J-code on every office-administered biologic
IVIG per-gram accuracy: 100% — correct unit count on every infusion
Monthly report: revenue per allergist, per service category (testing vs immunotherapy vs biologic vs IVIG vs E&M), per payer
Numbers based on industry benchmarks — your practice-specific results reported monthly.
FAQ
Gastroenterology Billing Questions
What is the most common allergy testing billing error?
Two tied — incorrect method code application (billing percutaneous codes for intradermal testing or vice versa) and incorrect per-test count documentation (billing a single testing code instead of per-test units based on the number of allergens tested). The free audit includes an allergy testing code accuracy review on recent testing encounters.
We give two immunotherapy injections per visit. How should that be billed?
95117 — professional services for allergen immunotherapy, two or more injections per encounter. Not 95115 × 2. A single 95117 correctly covers a multi-injection visit and is the appropriate code when two or more allergen injections are administered in one session.
Are we billing antigen preparation separately?
If your practice prepares multi-dose allergen vials for immunotherapy patients and is not billing 95165 per dose, you are missing a significant recurring revenue source. Most allergy practices prepare dozens of multi-dose vials monthly and bill zero units of 95165. The audit will show your current antigen preparation billing capture rate.
Can you handle prior authorization for biologic asthma therapy?
Yes — biomarker-specific auth packages per biologic per payer (eosinophil count for IL-5/IL-5R biologics, IgE for omalizumab, FeNO for dupilumab/tezepelumab), step therapy failure documentation, and auth renewal on the administration schedule specific to each biologic. Chronic urticaria omalizumab auth with antihistamine failure documentation also managed.
We administer IVIG for primary immunodeficiency. Is our billing complete?
IVIG billing requires administration codes (96365–96366) and drug supply (J1459 per gram) — both must be on every infusion claim. Per-gram calculation based on the documented dose administered is critical — billing per vial rather than per gram creates both underbilling and compliance exposure. The audit shows your current IVIG billing accuracy.
What makes allergy billing harder than general medical billing?
Testing method-specific code selection with per-test count requirements, immunotherapy multi-component billing (injection administration plus antigen preparation — the most missed component in allergy), biologic two-component billing with biomarker-specific auth, oral food challenge time-based billing, IVIG per-gram calculations, and primary immunodeficiency infusion billing. A general biller applies standard infusion and injection billing to allergy — that approach misses antigen preparation billing and creates testing code errors on every testing day.
Find Out What Your Allergy Practice Should Be Collecting Per Testing Day and Per Injection Visit
The free allergy and immunology billing audit reviews your testing method coding, immunotherapy injection code accuracy, antigen preparation billing, biologic drug supply capture, IVIG per-gram billing, and denial patterns — and shows you in plain numbers what every testing day and every injection visit should be generating versus what it actually is.
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