Learn the keys to successful billing for allergists
Get control of your billing to save time, reduce your workload, and increase your revenue.
Allergy and immunology billing has a shape unlike any other specialty. Treatment stretches across months and years, a single course of immunotherapy generates preparation and administration charges on different days by design, and the units on a claim have to match what was actually mixed and actually injected. When the record-keeping slips, the claims slip with it.
This guide covers how billing works in an allergy practice, the specialty-specific details that decide whether claims pay, and what to expect from a billing service that knows the specialty.
Your practice is a business
Allergists, like most physicians, get little training in billing or revenue cycle management — yet billing is where the practice's sustainability is decided. Viewing the practice as a business isn't a distraction from patient care; it's what funds it. Fair contracts, accurate claims, and disciplined follow-up are how your expertise gets paid for.
How billing flows in an allergy practice
Receive and document the referral, and verify eligibility and benefits — including the patient's allergy testing and immunotherapy benefits, which are often carved out or capped.
Document the evaluation and the medical necessity of testing and treatment.
Bill testing (percutaneous, intradermal, patch) with the correct codes and units.
For immunotherapy patients: bill antigen preparation when doses are prepared, and administration when they're given — two different events, often on different days.
Obtain and track authorizations and visit limits for ongoing treatment.
Submit, post, follow up, and work denials through to payment.
Where allergy billing gets specific
Immunotherapy: preparation is not administration
The most common structural error in allergy billing is blurring preparation and administration. Antigen preparation (CPT 95165) is billed in units based on the number of doses prepared; administration (95115 for a single injection, 95117 for two or more) is billed on the day the patient is actually injected. Dose counts, vial records, and injection logs have to reconcile — payers audit this, and discrepancies are expensive.
Supervision and who gave the shot
Immunotherapy administration carries supervision requirements, and the record should show who administered the injection and under whose supervision. When the documentation doesn't establish it, a payable claim becomes a compliance question instead.
Testing codes and units
Percutaneous tests (95004), intradermal tests (95024), and patch tests (95044) each bill differently — some per test, some per session. Unit errors here are quiet revenue leaks in both directions: underbilled tests leave money behind; overbilled units invite recoupment.
Benefits, caps, and authorizations
Many plans limit allergy testing frequency or cap immunotherapy visits. Verifying those limits up front — and tracking them as treatment progresses — prevents the worst kind of denial: the one for a service already rendered to a patient sitting in your waiting room.
Study the guidelines — and keep studying them
CMS publishes billing and coding guidance for allergy testing and immunotherapy, and payers layer their own policies on top. The AAAAI and ACAAI both maintain practice-management resources and coding training built on those sources, and the AAPC's Codify portal keeps CPT detail current. Someone in your practice — or your billing service — needs a routine for absorbing updates as they're issued, because this specialty's rules genuinely move.
Documentation is the claim
Payers pay what's documented: the medical necessity of testing, the antigens and doses prepared, the injections given, the supervision provided. Complete, contemporaneous documentation is what makes codes defensible — and it's why many allergy practices pair billing support with documentation help, so the record is built correctly during the visit instead of reconstructed afterward.
The role of your billing service
Before submission, your billing service reviews documentation and scrubs claims — units, codes, modifiers, authorization status — so problems are fixed before payers see them. After submission, it tracks every claim, and for each denial: identifies the reason, corrects or appeals, resubmits, and follows the claim to payment. In allergy, it also watches the slow leaks — vial wastage patterns, unit drift between preparation and administration, patients approaching benefit caps.
The reports you should be seeing
Clean claims rate — claims accepted and processed without errors or rejections.
Days in A/R — the average time from service to payment.
Collection ratio — what you collect against what you bill.
Denial rate and reasons — trended, so recurring causes get fixed at the source.
A/R aging — the share of balances past 90 days should stay small and explained.
Why specialty focus matters
Doctors One Solution bills for allergy and immunology practices nationwide, and immunotherapy's preparation/administration split is exactly the kind of detail a generalist billing service learns at your expense. If you'd like a specialist's read on your denial patterns and A/R, start with a free 15-minute billing and A/R review: contact us or call (855) 570-4077.