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M89.632 ICD-10-CM Code: Osteopathy after poliomyelitis, left forearm

M89.632 maps to CMS-HCC V28 92. A source-labeled RAF reference is available. Documentation must support MEAT. MEAT criteria · RAF Calculator · HCC coding software

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

M89.632

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

Osteopathy after poliomyelitis, left forearm

Bone disease that develops as a long-term consequence of polio infection, affecting the left forearm.

Buddy the Bee presenting code insight

Buddy Insight

Left forearm post-polio osteopathy involves chronic bone deterioration in the left radius and ulna as a late consequence of poliomyelitis infection, potentially compromising forearm function and hand dexterity.

CMS-HCC V28

HCC 92

Code-level coefficient reference

CMS-HCC V24

Historical

Historical

Not used for CY2026 payment

ACA/HHS

HCC 055

Code-level coefficient reference

ESRD/PACE

HCC 39

Code-level coefficient reference

RXHCC

N/A

—

Not mapped

Code Book Path

Official
M89.6Osteopathy after poliomyelitis
M89.63Osteopathy after poliomyelitis, forearm
M89.632Osteopathy after poliomyelitis, left forearm

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for M89.632 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for M89.632 in this effective period.

Related Child Codes

Official
M89.631Osteopathy after poliomyelitis, right forearm
M89.639Osteopathy after poliomyelitis, unspecified forearm

Includes

Official

ICD-10-CM does not list Includes notes for M89.632 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for M89.632 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for M89.632 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for M89.632 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for M89.632 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance
Documented history of previous poliomyelitis infection
Specific documentation of left forearm bone involvement
Current imaging showing post-polio changes in radius and ulna
Left forearm and hand functional assessment

MEAT Support

HCC Buddy guidance
Documented history of previous poliomyelitis infection
Specific documentation of left forearm bone involvement
Current imaging showing post-polio changes in radius and ulna
Left forearm and hand functional assessment

Audit Caution

HCC Buddy guidance
Mixing up neurological versus bone manifestations of post-polio complications
Confusing left and right forearm laterality
Missing the historical connection to poliomyelitis infection
Incorrectly coding as acute trauma or primary bone disease

Common Mistakes

HCC Buddy guidance
G14 — Post-polio syndrome primarily neurological, not bone-related
M25.532 — Left forearm pain is symptomatic presentation only
S52.502A — Forearm fracture represents acute trauma
M19.032 — Primary wrist osteoarthritis lacks post-infectious etiology

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is M89.632 an HCC code?

Yes. M89.632 (Osteopathy after poliomyelitis, left forearm) maps to HCC 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.479. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: M89.632 is billable and maps to V28 HCC 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code
M89.632
Description
Osteopathy after poliomyelitis, left forearm
HCC (V28)
HCC 92 — Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
RAF reference coefficient
0.479
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
0.479
ESRDHCC 39, Bone/Joint/Muscle Infections/Necrosis
Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work M89.632 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for M89.632

For M89.632 to 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 M89.632 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

M89.632 is the ICD-10-CM diagnosis code for osteopathy after poliomyelitis, left forearm. Bone disease that develops as a long-term consequence of polio infection, affecting the left forearm. M89.632 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 CMS-HCC V28 risk adjustment model, M89.632 maps to Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis (HCC 92) with a source-labeled community, non-dual, aged reference coefficient of 0.479. No V24 mapping is shown for M89.632; use the applicable model and payment year when reviewing the V28 mapping. 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. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

This code is used for post-polio sequelae affecting bone structure; ensure polio history is documented. Because M89.632 maps to an HCC category, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment. 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, source-labeled coefficient references, and MEAT documentation criteria for M89.632 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •This code is used for post-polio sequelae affecting bone structure; ensure polio history is documented
  • •Verify laterality is clearly documented as left before assigning this code

Clinical Significance

Left forearm post-polio osteopathy involves chronic bone deterioration in the left radius and ulna as a late consequence of poliomyelitis infection, potentially compromising forearm function and hand dexterity. This represents a significant long-term sequela requiring specialized care.

Documentation Requirements

  • ✓Documented history of previous poliomyelitis infection
  • ✓Specific documentation of left forearm bone involvement
  • ✓Current imaging showing post-polio changes in radius and ulna
  • ✓Left forearm and hand functional assessment
  • ✓Grip strength testing and fine motor evaluation
  • ✓Pain quantification and impact on daily activities
  • ✓Occupational therapy recommendations and adaptive strategies
  • ✓Coordination with comprehensive post-polio syndrome care

Commonly Confused Codes

  • •G14: Post-polio syndrome primarily neurological, not bone-related
  • •M25.532: Left forearm pain is symptomatic presentation only
  • •S52.502A: Forearm fracture represents acute trauma
  • •M19.032: Primary wrist osteoarthritis lacks post-infectious etiology
  • •M87.832: Other osteonecrosis has different underlying pathophysiology

Child Codes

M89.631Osteopathy after poliomyelitis, right forearm
HCC 92
M89.632Osteopathy after poliomyelitis, left forearm
HCC 92
M89.639Osteopathy after poliomyelitis, unspecified forearm
HCC 92

Code Hierarchy

└M89Other disorders of bone└M89.6Osteopathy after poliomyelitis└M89.63Osteopathy after poliomyelitis, forearm└M89.632Osteopathy after poliomyelitis, left forearm
└M89.632Osteopathy after poliomyelitis, left forearm

Because M89.632 maps to an HCC category, the documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment.

M89.632 maps to CMS-HCC V28 category 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. The mapping identifies a payment HCC category for M89.632. Review its source-labeled HCC coefficient above, check the RAF Calculator with complete member context for CMS-HCC V28 PY2026, and confirm the documentation the chart needs before the code is submitted. HCC Buddy shows no RAF score unless every required source and calculation check passes.

Work M89.632 in HCC Buddy

Open M89.632 in the Code Book for the full Index-to-Tabular path, MEAT checklist, and V28 HCC mapping, or in the Encoder to code from a keyword search. Pro includes 7 days to try everything, no card required.

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