Q77.0 ICD-10-CM Code: Achondrogenesis
HCC Buddy Code Card
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FY 2026 Apr update / Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0) / Congenital malformations and deformations of the musculoskeletal system (Q65-Q79)
Q77.0
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAchondrogenesis
A severe, usually lethal birth defect where bones fail to develop properly, resulting in extremely short stature and underdeveloped limbs.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Hypochondrogenesis
Excludes 2
Official- congenital myotonic chondrodystrophy (G71.13)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for Q77.0 in this effective period.
Excludes 1
Official- mucopolysaccharidosis (E76.0-E76.3)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for Q77.0 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for Q77.0 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for Q77.0 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is Q77.0 an HCC code?
No. Q77.0 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
Q77.0 is the ICD-10-CM diagnosis code for achondrogenesis. A severe, usually lethal birth defect where bones fail to develop properly, resulting in extremely short stature and underdeveloped limbs. Q77.0 sits in the ICD-10-CM chapter for congenital malformations, deformations and chromosomal abnormalities (q00-qa0), within the section covering congenital malformations and deformations of the musculoskeletal system (q65-q79).
Q77.0 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
This condition is typically incompatible with life; document perinatal outcome.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Q77.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This condition is typically incompatible with life; document perinatal outcome
- •Distinguish from other skeletal dysplasias that may have better prognosis