Q77.4

Achondroplasia

Billable code

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · Q77.4
Synonyms

Hypochondroplasia Osteosclerosis congenita

Inherited from Q77Osteochndrdys w defects of growth of tubular bones and spine
Excludes 1

mucopolysaccharidosis (E76.0-E76.3)

Excludes 2

congenital myotonic chondrodystrophy (G71.13)

Inherited from chapter 17Congenital malformations, deformations and chromosomal abnormalities
Excludes 2

inborn errors of metabolism (E70-E88)

Official Guidelines for Q77.4

FY 2026 ›
I.C.17Chapter-specific guidanceChapter 17: Congenital malformations, deformations, and chromosomal abnormalities (Q00-QA1)

Sections that reference Q77.4

Sections whose FY 2026 text names Q77.4, its Q77 category, or a range containing it — the chapter guidance above is the authoritative source.

Find Q77.4 in the alphabetic index

7 index paths lead to this code