Q78.4 – Enchondromatosis

ICD-10-CM 2027 diagnosis code · Congenital malformations and deformations of the musculoskeletal system

Billable code

ICD-10-CM code Q78.4

Code: Q78.4 (claims format: Q784)
Description: Enchondromatosis
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
Block: Q65-Q79 Congenital malformations and deformations of the musculoskeletal system
Parent codes: Q78

Notes for Q78.4

Applicable to:

Maffucci's syndrome
Ollier's disease

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Q78 – Other osteochondrodysplasias

Excludes2 (not included here):

congenital myotonic chondrodystrophy (G71.13)

Index terms for Q78.4

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in Q78

Q78.0 – Osteogenesis imperfectaBillable
Q78.1 – Polyostotic fibrous dysplasiaBillable
Q78.2 – OsteopetrosisBillable
Q78.3 – Progressive diaphyseal dysplasiaBillable
Q78.5 – Metaphyseal dysplasiaBillable
Q78.6 – Multiple congenital exostosesBillable
Q78.8 – Other specified osteochondrodysplasiasBillable
Q78.9 – Osteochondrodysplasia, unspecifiedBillable

Frequently asked questions

What is ICD-10 code Q78.4?

Q78.4 is the ICD-10-CM code for enchondromatosis, in the block Q65-Q79 (Congenital malformations and deformations of the musculoskeletal system).

Is Q78.4 a billable code?

Yes. Q78.4 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Q78.4 belong to?

It belongs to category Q78 – Other osteochondrodysplasias.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.