Q66.219 ICD-10-CM Code: Congenital metatarsus primus varus, unspecified foot
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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)
Q66.219
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceCongenital metatarsus primus varus, unspecified foot
A congenital foot deformity where the first metatarsal bone is angled inward, but the specific foot (right or left) is not documented.
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
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for Q66.219 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for Q66.219 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for Q66.219 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for Q66.219 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for Q66.219 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for Q66.219 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for Q66.219 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 Q66.219 an HCC code?
No. Q66.219 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
Q66.219 is the ICD-10-CM diagnosis code for congenital metatarsus primus varus, unspecified foot. A congenital foot deformity where the first metatarsal bone is angled inward, but the specific foot (right or left) is not documented. Q66.219 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).
Q66.219 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.
Use this code only when laterality cannot be determined from the medical record; query provider if possible for more specific coding.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Q66.219 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.