L56.1 — Drug photoallergic response

Billable

Is L56.1 billable?

Yes — L56.1 is billable for FY2027. L56.1 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. L56.1 may be submitted for encounters from October 1, 2026 through September 30, 2027.

L56.1 at a glance

Code	L56.1
Description	Drug photoallergic response
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does L56.1 group to?

L56.1 sits in MDC 09 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

606Minor Skin Disorders with MCCmedical
607Minor Skin Disorders without MCCmedical

How is L56.1 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to L56.1. They show the wording a clinician may have documented, which often differs from the Tabular description.

Response › photoallergic (drug)
Reaction › drug NEC › photoallergic

Use additional code

Report an additional code alongside L56.1 to fully describe the condition. L56.1 is sequenced first.

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Use additional code — inherited from L56

Report an additional code alongside L56.1 to fully describe the condition. L56.1 is sequenced first.

code to identify the source of the ultraviolet radiation (W89, X32)

Excludes2 — not included here — inherited from Chapter 12

The conditions below are not part of L56.1, but a patient may have both at the same time. When documentation supports it, L56.1 and the excluded code may both be reported.

certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
lipomelanotic reticulosis (I89.8)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
systemic connective tissue disorders (M30-M36)
viral warts (B07.-)

How long has L56.1 existed?

L56.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.