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M91.1 ICD-10-CM Code: Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes]

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Official Registry Overview & Definition

Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes] is a non-billable ICD-10-CM category code (M91.1). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for M91.1 in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Frequently Compared Codes

The official Excludes notes on M91.1 name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.

Verify Before Coding

  • Not billable as written — a more specific code is required.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Relationships & Classification

Other codes that name M91.1 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

1 Excludes1 notes: M87 (via M91.-).

Contextual Map

Every relationship of M91.1 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • M00-M99 — Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) (M00-M99) [Hierarchy]
  • M91-M94 — Chondropathies [Hierarchy]

Referenced by Excludes1 notes

  • M87 — Osteonecrosis [Excludes1](via M91.-): “juvenile osteonecrosis (M91-M92)” · check together

Nearest codes (25)

  • M91 — Juvenile osteochondrosis of hip and pelvis [Sibling]
  • M91.0 — Juvenile osteochondrosis of pelvis [Sibling]
  • M91.10 — Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], unspecified leg [Sibling]
  • M91.11 — Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], right leg [Sibling]
  • M91.12 — Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], left leg [Sibling]
  • M91.2 — Coxa plana [Sibling]
  • M91.20 — Coxa plana, unspecified hip [Sibling]
  • M91.21 — Coxa plana, right hip [Sibling]
  • and 17 more

Frequently Asked Questions (FAQ) & Clinical Guidance

Can M91.1 be billed directly?

No. M91.1 (Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes]) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M91.1 in its code family, with their registry titles.

  • M91 — Juvenile osteochondrosis of hip and pelvis
  • M91.0 — Juvenile osteochondrosis of pelvis
  • M91.10 — Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], unspecified leg
  • M91.11 — Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], right leg
  • M91.12 — Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], left leg
  • M91.2 — Coxa plana
  • M91.20 — Coxa plana, unspecified hip
  • M91.21 — Coxa plana, right hip
  • M91.22 — Coxa plana, left hip
  • M91.3 — Pseudocoxalgia

View all codes in the M91 family