Allergy billing hinges on immunotherapy vial preparation (95144/95165) versus injection administration (95115/95117), percutaneous and intradermal testing (95004/95024), and RAST immunoassay (86003) capture. Add modifier 25 when an E/M is performed the same day as injection or testing — and general billers miss revenue on every encounter. MedFactor delivers allergy-specific RCM that protects every claim.
From allergic rhinitis and immunotherapy to asthma, venom sensitivity, and primary immunodeficiency, we tailor billing to the coding rules of every allergy/immunology subspecialty.
Allergic rhinitis (J30), pollen/cat dander immunotherapy vial prep 95144/95165, injection 95115/95117, and build-up/maintenance dose capture.
Asthma (J45), biologic injectable infusions with J-code supply capture, spirometry 94010/94150, and asthma control documentation.
Food allergy (Z91.0), drug allergy (Z88), oral food challenge, component testing, and RAST/immunoassay 86003 capture per allergen.
Atopic dermatitis (L20), patch testing 95052/95056, and biologic supply capture with modifier 25 for same-day E/M.
Immunodeficiency (D84), IVIG/SCIG infusion J-codes, infusion administration 96365/96372, and drug wastage reporting.
Hymenoptera venom immunotherapy 95130–95134, venom single-dose 95140, and anaphylaxis (T78) emergency capture.
Allergen immunotherapy is billed as vial preparation (compounding/mixing) plus separate per-visit injection administration codes — and allergy testing and same-day E/M must be reported with the right modifiers or they're denied as bundled. This is the largest source of allergy/immunology denials.
Vial prep (95144 single-dose or 95165 multi-dose) is billed for compounding; injection admin (95115 single / 95117 multiple) is billed per encounter; testing and same-day E/M are separately reportable with modifiers.
Allergy billing is governed by the vial-prep vs. injection-administration distinction, allergy testing bundling, RAST capture, and modifier 25 rules that general billing companies cannot navigate effectively.
Preparation (compounding) and administration codes conflated — vial prep dropped or injection billed as prep, losing per-dose and per-encounter revenue.
Percutaneous, intradermal, and patch testing denied as bundled into each other or into the immunotherapy encounter when billed without correct units and modifiers.
Allergen-specific IgE (86003) under-billed one unit per allergen or denied for missing per-allergen documentation, losing lab revenue.
Same-day E/M with immunotherapy injection or allergy testing denied as bundled when modifier 25 is omitted or documentation doesn't support a separate service.
Hymenoptera venom immunotherapy (95130–95134) and single-dose venom (95140) under-captured or denied without proper venom extract documentation.
Office visits billed alongside immunotherapy denied for medical necessity or lack of separate, documented E/M content beyond the injection service.
Quick reference for the most frequently used codes in allergy and immunology billing and coding.
| Code | Description | Common Use |
|---|---|---|
| 95115 | Allergen immunotherapy, single injection admin | One injection per encounter |
| 95117 | Allergen immunotherapy, 2+ injections admin | Multiple injections, one unit |
| 95144 | Single-dose vial preparation, per vial | Compounding single-dose vials |
| 95165 | Multi-dose vial preparation, per dose | Compounding multi-dose vials (1 cc dose for Medicare) |
| 95199 | Unlisted allergy/immunology service | Sublingual immunotherapy (SLIT) and unlisted |
| 95004 | Percutaneous / scratch allergy test | Skin-prick testing per allergen |
| 95024 | Intradermal allergy test | Intradermal testing per allergen |
| 95028 | Intradermal test with delayed reading | Delayed hypersensitivity testing |
| 95052 | Patch test, application | Allergic contact dermatitis patch application |
| 95056 | Inhalation challenge test | Bronchial challenge testing |
| 86003 | Allergen-specific IgE immunoassay (RAST), each allergen | Quantitative in-vitro allergy testing |
| 95130–95134 | Venom immunotherapy, single dose | Hymenoptera venom preparation |
| 95140 | Venom immunotherapy, single dose, per dose | Single-dose venom extract |
| 96365 | IV infusion, first hour | IVIG / biologic infusion administration |
| 99202–99215 | Office / outpatient E/M | New and established visits |
| Code | Description | Clinical Context |
|---|---|---|
| J30.x | Allergic rhinitis | Vasomotor / seasonal / perennial rhinitis |
| J45.x | Asthma | Asthma classification / control |
| J45.909 | Unspecified asthma, uncomplicated | Asthma without further specification |
| L20.x | Atopic dermatitis / eczema | Atopic eczema |
| Z88.x | Allergy status to drugs / substances | Drug allergy status |
| Z91.0 | Allergy status, other than drugs | Food / environmental allergy status |
| T78.x | Anaphylaxis / adverse food reaction | Anaphylactic shock / reactions |
| T36–T50 | Drug allergy / adverse effect (poisoning) | Adverse effect of drugs / medicaments |
| D84.x | Immunodeficiency / immune disorders | Primary immunodeficiency, IVIG |
| R09.81 | Nasal congestion | Symptom supporting rhinitis workup |
| Modifier | Description | Allergy Application |
|---|---|---|
| 25 | Separate E/M same day | E/M with same-day immunotherapy injection / allergy testing |
| 59 | Distinct procedural service | Distinct testing procedures same session |
| 51 | Multiple procedures | Multiple allergy testing modalities same session |
| 52 | Reduced services | Reduced number of allergens / partial testing |
| 22 | Increased procedural service | Unusually complex immunotherapy compounding |
| 50 | Bilateral procedure | Bilateral intradermal / skin test application |
| 33 | Preventive service | Preventive allergy / asthma counseling |
| GT | Telehealth service | Telehealth E/M for immunotherapy follow-up |
Comprehensive revenue cycle management designed specifically for allergy and immunology practices.
Specialty coders handle vial prep vs. injection 951xx distinction, skin testing 95004/95024, RAST 86003, and venom 95130–95134 with accuracy.
Vial-prep vs. injection defense, testing bundling corrections, modifier 25 appeals with documentation for allergy/immunology denials.
Pre-service authorization for biologic injectables, IVIG/SCIG, RAST panels, and venom immunotherapy treatment plans.
Prioritized follow-up on aged immunotherapy, testing, and infusion claims with strategic payer escalation to maximize recovery.
Regular audits focused on vial-prep dosing, testing bundling, modifier 25 documentation, and infusion/J-code capture.
Real-time dashboards tracking immunotherapy build-up vs. maintenance, testing volume, and infusion productivity.
Understanding the most common denial reasons is the first step to preventing them on immunotherapy, testing, and infusion claims.
Vial preparation (95144/95165) billed as injection administration or vice versa, losing per-dose and per-encounter revenue.
Clear separation of preparation (95144/95165 per dose) and administration (95115/95117 per encounter) on every claim.
Percutaneous, intradermal, and patch testing denied as bundled into each other or into the immunotherapy encounter.
Correct per-allergen units and modifier 59/51 for distinct testing procedures same session.
Allergen-specific IgE immunoassay under-billed one unit per allergen or denied for missing per-allergen documentation.
One unit per allergen with lab documentation supporting each allergen tested.
Same-day E/M with immunotherapy injection or testing denied as bundled when modifier 25 is omitted or unsupported.
Modifier 25 applied only when a significant, separately identifiable E/M is documented beyond the injection/testing.
Identifying and plugging these common revenue leakage points can significantly improve your practice's bottom line.
Multi-dose vial preparation 95165 not billed per dose at each compounding encounter.
Percutaneous 95004 and intradermal 95024 billed as one unit instead of per allergen.
Same-day E/M with immunotherapy not billed with modifier 25 when separately identifiable.
Allergen-specific IgE 86003 billed as a panel instead of one unit per allergen tested.
See how allergy-specific revenue cycle management transforms your practice's financial performance.
A structured onboarding process designed to deliver measurable improvements within the first 90 days.
Review of allergy billing operations, vial-prep dosing, testing units, and revenue cycle baseline.
EMR and immunotherapy extract-log integration, dedicated allergy billing team, and payer enrollment.
Full billing with real-time claim submission, modifier verification, and denial prevention protocols.
Performance review against baseline, workflow optimization, and documented revenue improvement.
How our allergy-specific approach compares to in-house billing and general medical billing companies.
| Capability | In-House Team | General Billing Co. | MedFactor Allergy |
|---|---|---|---|
| Vial prep 95144/95165 vs. injection 95115/95117 separation | Inconsistent | ✕ | ✓ |
| Allergy testing 95004/95024 per-allergen billing | Inconsistent | ✕ | ✓ |
| RAST / 86003 per-allergen capture | ✕ | ✕ | ✓ |
| Modifier 25 with same-day injection/testing | Inconsistent | ✕ | ✓ |
| Venom immunotherapy 95130–95134 capture | Manual | Partial | ✓ |
| IVIG / SCIG infusion J-code & wastage capture | Manual | Partial | ✓ |
| Immunotherapy build-up vs. maintenance tracking | ✕ | ✕ | ✓ |
| Biologic / injectable prior auth | Manual | Partial | ✓ |
| Dedicated allergy billing team | ✕ | ✕ | ✓ |
Our team combines deep allergy and immunology billing expertise with the technology and processes to deliver consistent, measurable results for immunotherapy, testing, and infusion practices.
Discover exactly where your allergy practice is losing revenue. Our no-obligation audit analyzes your vial-prep dosing, testing units, RAST capture, and modifier 25 compliance.
Real results from allergy and immunology practices that partnered with MedFactor for specialty revenue cycle management.
A rhinitis and immunotherapy practice was billing multi-dose vial prep (95165) as a single injection (95115) and dropping per-dose revenue. MedFactor separated preparation from administration and captured every dose, recovering substantial immunotherapy revenue in seven months.
An asthma and allergy clinic was billing RAST (86003) as a panel instead of one unit per allergen and under-billing skin testing. MedFactor implemented per-allergen billing for both RAST and 95004/95024, recovering lab and testing revenue per encounter.
An immunodeficiency and infusion center was missing IVIG J-code supply capture and infusion administration (96365) on every visit. MedFactor implemented J-code and wastage capture with infusion administration billing, protecting infusion revenue.
No matter where your allergy and immunology practice operates, our team understands the payer landscape and regulatory requirements in your region.
Deep coding knowledge across Medicare, Medicaid, and all major commercial payers for allergy services.
Vial-prep dosing and injection administration rules applied correctly across all 50 states.
Facility and professional billing coordination across hospital-based IVIG/SCIG infusion.
State Medicaid immunotherapy and testing coverage rules applied correctly per region.
Common questions from allergy and immunology practices considering MedFactor's specialty RCM services.
Allergen immunotherapy separates preparation from administration. Vial preparation codes cover the compounding and mixing of antigens: 95144 for single-dose vials (billed per vial) and 95165 for multi-dose vials (billed per dose — Medicare defines a dose as 1 cc of extract, with a maximum of 10 billable doses per 10 cc vial and an MUE of 30 units per day). Injection administration codes cover the per-encounter injection: 95115 for a single injection and 95117 for two or more injections (one unit regardless of how many). The two are billed together — preparation when the vial is mixed and administration each time the patient receives an injection. We capture both per-dose preparation and per-encounter administration rather than conflating them, which is the most common way immunotherapy revenue is lost.
Allergy skin testing is billed per allergen, not as a panel. Percutaneous (scratch/prick) testing is 95004 per allergen and intradermal testing is 95024 per allergen; 95028 covers intradermal testing with delayed reading and 95052 covers patch test application. These codes have NCCI edits that can bundle certain combinations when billed together in the same session, so distinct procedures need modifier 59 (or 51 for multiple procedures where appropriate) and the per-allergen unit count must be documented. We verify edit pairs before submission and bill one unit per allergen with the supporting documentation so testing is paid rather than denied for bundling or under-uniting.
CPT 86003 (allergen-specific IgE immunoassay; quantitative or semiquantitative, each allergen) is billed one unit per allergen tested — not as a panel. Each allergen-specific IgE result requires its own unit, and the lab documentation must support each allergen ordered. The older radioallergosorbent (RAST) terminology now falls under 86003 as the immunoassay code. We capture one unit per allergen with the supporting lab order and result documentation so RAST/immunoassay revenue isn't lost to panel-only billing or denied for missing per-allergen support.
Modifier 25 is appended to an E/M code (99202–99215) when a significant, separately identifiable evaluation and management service is performed on the same day as an allergy testing procedure or immunotherapy injection. The E/M must be above and beyond the usual pre- and post-service work of the injection or test — for example, a separate assessment for a new asthma exacerbation or a change in the immunotherapy treatment plan. We document the separate E/M content and append modifier 25 only when that threshold is met; without it the E/M is denied as bundled into the injection/testing, and appending it without supporting documentation invites audit risk.
Hymenoptera (stinging insect) venom immunotherapy uses a distinct code family: 95130–95134 cover venom immunotherapy single-dose preparation per dose, and 95140 covers single-dose venom extract preparation. The injection administration is still billed with 95115 (single) or 95117 (multiple) per encounter, separate from the preparation codes. Venom immunotherapy requires documentation of the specific venom(s) prepared (e.g., bee, wasp, hornet, yellow jacket, fire ant) and the dose/volume. We capture the venom preparation codes per dose alongside per-encounter injection administration with the supporting venom extract documentation, which is frequently under-captured in general billing.
Yes — but only when the E/M is a significant, separately identifiable service beyond the routine pre-injection assessment bundled into the immunotherapy administration code. A routine dose check and observation after injection is part of 95115/95117 and not separately billable; a separate E/M is billable with modifier 25 when there is a documented new problem, change in treatment plan, or unrelated condition evaluated (such as an acute asthma flare or a new allergic complaint). We review each same-day E/M against the documentation threshold and bill modifier 25 only where the separate service is clearly supported, preventing both under-capture and audit risk.
MedFactor applies the same code-level precision across the full practice spectrum. See how we bill these related specialties.
CPT®, ICD-10, HCPCS, and modifier codes referenced on this page reflect the current code sets and are subject to annual updates — always verify against the current-year fee schedule before submission. KPIs and case-study figures shown are representative benchmarks, not guarantees of individual practice results.
Your allergy practice deserves billing partners who know vial-prep 95165 vs. injection 95115/95117, RAST 86003 per-allergen capture, and modifier 25 with same-day E/M — and code every claim correctly. Let MedFactor show you what specialty RCM can do.