What is ICD-10 code M87.145?

M87.145 is the ICD-10-CM diagnosis code for Osteonecrosis due to drugs, left finger(s). Death of bone tissue in the fingers of the left hand caused by medication side effects, potentially affecting grip strength and fine motor function. M87.145 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. M87.145 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. M87.145 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. M87.145 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for M87.145?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. M87.145 was a payment HCC under V24 (Bone/Joint/Muscle Infections/Necrosis) but the V28 recalibration removed it from the risk adjustment model. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting M87.145?

Confirm left-hand involvement is clearly documented to avoid miscoding as right hand or unspecified Note that this code encompasses all fingers of the left hand regardless of how many are affected Because M87.145 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

M87.145: Osteonecrosis due to drugs, left finger(s) — ICD-10 | Bone/Joint/Muscle

ICD-10-CM Code View

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Code lookupM87.145Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Other osteopathies (M86-M90)

M87.145

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Osteonecrosis due to drugs, left finger(s)

Death of bone tissue in the fingers of the left hand caused by medication side effects, potentially affecting grip strength and fine motor function.

Buddy Insight

Drug-induced osteonecrosis of left fingers involves medication-related bone death specifically affecting finger bones, with consideration for dominant hand impact on functional capacity.

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Mapped

HCC 39

Bone/Joint/Muscle Infections/...

RAF 0.401

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Mapped

HCC 39

Bone/Joint/Muscle Infections/...

RAF 0.0

RXHCC

Mapped

HCC 80

Bone/Joint/Muscle Infections/...

RAF 0.0

Code Trumping

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Code Book Path

Official

M87.1Osteonecrosis due to drugs

M87.14Osteonecrosis due to drugs, hand and fingers

M87.145Osteonecrosis due to drugs, left finger(s)

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for M87.145 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for M87.145 in this effective period.

Related Child Codes

Official

M87.141Osteonecrosis due to drugs, right hand

M87.142Osteonecrosis due to drugs, left hand

M87.143Osteonecrosis due to drugs, unspecified hand

M87.144Osteonecrosis due to drugs, right finger(s)

M87.146Osteonecrosis due to drugs, unspecified finger(s)

Includes

Official

ICD-10-CM does not list Includes notes for M87.145 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for M87.145 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for M87.145 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for M87.145 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for M87.145 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Clear documentation of left finger osteonecrosis involvement

Causative drug identification with exposure details

Imaging evidence of finger bone necrosis

Functional assessment including pinch strength and fine motor skills

MEAT Support

HCC Buddy guidance

Clear documentation of left finger osteonecrosis involvement

Causative drug identification with exposure details

Imaging evidence of finger bone necrosis

Functional assessment including pinch strength and fine motor skills

Audit Caution

HCC Buddy guidance

Reversing laterality in left/right finger documentation

Using broader hand codes when finger-specific involvement exists

Missing drug causation link in complex hand conditions

Using unspecified laterality when left side is clearly documented

Common Mistakes

HCC Buddy guidance

M87.144 — Right finger osteonecrosis, opposite side

M87.142 — Left hand osteonecrosis includes broader hand involvement

M87.146 — Unspecified finger when left side is documented

M87.245 — Post-traumatic left finger requires trauma history

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 M87.145 an HCC code?

Yes. M87.145 maps to Bone/Joint/Muscle Infections/Necrosis under the V24 model but is not retained in V28.

HCC Category Mapping

V24HCC 39, Bone/Joint/Muscle Infections/Necrosis

0.401

ESRDHCC 39, Bone/Joint/Muscle Infections/Necrosis

0.000

RxHCCHCC 80, Bone/Joint/Muscle Infections/Necrosis

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work M87.145 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for M87.145

For M87.145to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed M87.145 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

M87.145 is the ICD-10-CM diagnosis code for osteonecrosis due to drugs, left finger(s). Death of bone tissue in the fingers of the left hand caused by medication side effects, potentially affecting grip strength and fine motor function. M87.145 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other osteopathies (m86-m90).

Under the older CMS-HCC V24 model, M87.145 maps to Bone/Joint/Muscle Infections/Necrosis (HCC 39) with a community, non-dual, aged base RAF weight of 0.401. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Confirm left-hand involvement is clearly documented to avoid miscoding as right hand or unspecified. Because M87.145 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M87.145 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Confirm left-hand involvement is clearly documented to avoid miscoding as right hand or unspecified
•Note that this code encompasses all fingers of the left hand regardless of how many are affected

Clinical Significance

Drug-induced osteonecrosis of left fingers involves medication-related bone death specifically affecting finger bones, with consideration for dominant hand impact on functional capacity. This condition may require complex surgical intervention and extensive rehabilitation to maintain hand function and prevent disability.