Does L27.9 require prior authorization?

No, L27.9 does not require prior authorization (high confidence). Code is covered without prior authorization.

`L27.9` — Dermatitis due to unspecified substance taken internally

ICD-10-CM

No Prior Auth Required

Code is covered without prior authorization (high confidence)

Supportive documentation evidencing the condition and treatment must be documented in the medical record and be available to the Contractor upon request.
ICD-10-CM diagnosis codes supporting the medical necessity of the service must be submitted with each claim.
High-utilization or repeat testing should include clinical justification in the record (for example, repeat testing due to unsatisfactory response to treatment) to support medical necessity.
When E/M services are reported with allergy testing, medical documentation of the separately identifiable E/M service must be present in the medical record and modifier -25 must be used.

Allergy testing for inhalant allergens is covered when medically necessary; evaluation may include up to 90 prick-puncture tests followed by up to 40 intracutaneous tests if prick/puncture results are negative.
Allergy testing for food sensitivity is covered when medically necessary and may require up to 40 percutaneous tests.
Multitest intracutaneous testing of up to 60 tests may be appropriate in lieu of prick-puncture testing for selected patients (for example, young children, older adults, or needle-phobic individuals).
Exceeding the stated testing parameters may be covered when preliminary testing failed and immunotherapy failed to control symptoms, provided documentation supports medical necessity.
Allergy testing is covered when the patient has clinically significant allergic symptoms and conservative therapy has failed.
Allergy testing includes performance, evaluation, and reading of cutaneous and mucous membrane tests together with physician history (including immunologic history), physical examination, antigen selection, and interpretation of results.

A57473 — Billing and Coding: Allergy Testing

J05

L36402 — Allergy Testing

J05

AETNA-CPB-0577 — Laser Treatment for Psoriasis and Other Selected Skin Conditions

A57181 — Billing and Coding: Allergy Testing

L34313 — Allergy Testing

Ask Verity about documentation requirements, denial risks, or coverage in your state.