M79.643 ICD-10-CM Code: Pain in unspecified hand
HCC Buddy Code Card
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FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Other soft tissue disorders (M70-M79)
M79.643
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidancePain in unspecified hand
Pain in the hand when the specific side (left or right) is not documented or specified.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for M79.643 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for M79.643 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for M79.643 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for M79.643 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for M79.643 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for M79.643 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for M79.643 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 M79.643 an HCC code?
No. M79.643 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
M79.643 is the ICD-10-CM diagnosis code for pain in unspecified hand. Pain in the hand when the specific side (left or right) is not documented or specified. M79.643 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other soft tissue disorders (m70-m79).
M79.643 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 only when laterality is truly unspecified in the medical record.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M79.643 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use only when laterality is truly unspecified in the medical record
- •Attempt to clarify with provider documentation for proper laterality coding