M79.645 ICD-10-CM Code: Pain in left finger(s)
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Other soft tissue disorders (M70-M79)
M79.645
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidancePain in left finger(s)
Pain affecting one or more fingers on the left hand.
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 M79.645 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for M79.645 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for M79.645 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for M79.645 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for M79.645 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for M79.645 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for M79.645 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 M79.645 an HCC code?
No. M79.645 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
M79.645 is the ICD-10-CM diagnosis code for pain in left finger(s). Pain affecting one or more fingers on the left hand. M79.645 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).
M79.645 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.
Confirm left side documentation before assigning this code.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M79.645 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Confirm left side documentation before assigning this code
- •Review for associated conditions like arthritis or nerve compression affecting the fingers