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ICD-10-CM 2027

ICD-10 code for Legg-Perthes disease

M91.1

Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes]

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Legg (-Calvé)-Perthes disease, syndrome or osteochondrosis”. Page updated September 29, 2026.

About coding Legg-Perthes disease

The ICD-10-CM code for Legg-Perthes disease is M91.1 (Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes]).

Within M91 (juvenile osteochondrosis of hip and pelvis), M91.1 is specifically for juvenile osteochondrosis of head of femur [Legg-Calve-Perthes]. Related codes cover juvenile osteochondrosis of pelvis (M91.0), coxa plana (M91.2), Pseudocoxalgia (M91.3), coxa magna (M91.4), other juvenile osteochondrosis of hip and pelvis (M91.8) and unspecified (M91.9).

To report this condition, pick the subcode that matches the documentation: M91.10 (unspecified leg), M91.11 (right leg) and M91.12 (left leg).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about Legg-Perthes disease ICD-10 codes

What is the ICD-10 code for Legg-Perthes disease?

M91.1 — Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes] (a header code; report a more specific subcode).

Is M91.1 billable?

No. M91.1 is a header code. Report one of its more specific subcodes instead.