Q77.4 – Achondroplasia

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

Billable code

ICD-10-CM code Q77.4

Code: Q77.4 (claims format: Q774)
Description: Achondroplasia
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: Q77

Notes for Q77.4

Applicable to:

Hypochondroplasia
Osteosclerosis congenita

Notes inherited from parent codes

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

Q77 – Osteochondrodysplasia with defects of growth of tubular bones and spine

Excludes1 (not coded here):

mucopolysaccharidosis (E76.0-E76.3)

Excludes2 (not included here):

congenital myotonic chondrodystrophy (G71.13)

Index terms for Q77.4

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

Related codes in Q77

Q77.0 – AchondrogenesisBillable
Q77.1 – Thanatophoric short statureBillable
Q77.2 – Short rib syndromeBillable
Q77.3 – Chondrodysplasia punctataBillable
Q77.5 – Diastrophic dysplasiaBillable
Q77.6 – Chondroectodermal dysplasiaBillable
Q77.7 – Spondyloepiphyseal dysplasiaBillable
Q77.8 – Other osteochondrodysplasia with defects of growth of tubular bones and spineBillable
Q77.9 – Osteochondrodysplasia with defects of growth of tubular bones and spine, unspecifiedBillable

Frequently asked questions

What is ICD-10 code Q77.4?

Q77.4 is the ICD-10-CM code for achondroplasia, in the block Q65-Q79 (Congenital malformations and deformations of the musculoskeletal system).

Is Q77.4 a billable code?

Yes. Q77.4 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Q77.4 belong to?

It belongs to category Q77 – Osteochondrodysplasia with defects of growth of tubular bones and spine.

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.