What is ICD-10 code M89.659?

M89.659 is the ICD-10-CM diagnosis code for Osteopathy after poliomyelitis, unspecified thigh. Bone disease that develops as a complication of poliomyelitis affecting the thigh, but the specific side (left or right) is not documented or specified. M89.659 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. M89.659 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. M89.659 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. M89.659 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.

Which HCC does M89.659 map to under V28?

M89.659 maps to CMS-HCC V28 HCC 92 (Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis). The category numbers, labels, and conditions come from the CMS-HCC V28 model file for payment year 2026.

2026 ICD-10-CM M89.659: Osteopathy after

M89.659 maps to CMS-HCC V28 92. A source-labeled RAF reference is available. Documentation must support MEAT. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

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Code lookupM89.659Effective 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)

M89.659

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

Osteopathy after poliomyelitis, unspecified thigh

Bone disease that develops as a complication of poliomyelitis affecting the thigh, but the specific side (left or right) is not documented or specified.

Buddy Insight

Osteopathy after poliomyelitis affecting the thigh represents a chronic complication of previous polio infection, potentially causing bone deformities and functional limitations.

CMS-HCC V28

Mapped

HCC 92

Bone/Joint/Muscle/Severe Soft...

Code-level coefficient reference

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 055

HHS-HCC 055 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 39

Bone/Joint/Muscle Infections/...

Code-level coefficient reference

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

M89.6Osteopathy after poliomyelitis

M89.65Osteopathy after poliomyelitis, thigh

M89.659Osteopathy after poliomyelitis, unspecified thigh

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for M89.659 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for M89.659 in this effective period.

Related Child Codes

Official

M89.651Osteopathy after poliomyelitis, right thigh

M89.652Osteopathy after poliomyelitis, left thigh

Includes

Official

ICD-10-CM does not list Includes notes for M89.659 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for M89.659 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for M89.659 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for M89.659 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for M89.659 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Clear documentation of history of poliomyelitis infection

Evidence of osteopathy (bone disease) affecting the thigh region

Specification that laterality (right or left) is not documented or determinable

Clinical symptoms related to bone changes in the thigh area

MEAT Support

HCC Buddy guidance

Clear documentation of history of poliomyelitis infection

Evidence of osteopathy (bone disease) affecting the thigh region

Specification that laterality (right or left) is not documented or determinable

Clinical symptoms related to bone changes in the thigh area

Audit Caution

HCC Buddy guidance

Using this code when laterality is actually documented in the record

Confusing with postpolio syndrome which is primarily neurological

Failing to establish clear connection between current bone condition and prior polio

Not ensuring adequate documentation of both polio history and current osteopathy

Common Mistakes

HCC Buddy guidance

M89.651/M89.652 — Osteopathy after poliomyelitis, right/left thigh - when laterality is actually specified

G14 — Postpolio syndrome - neurological sequela rather than bone pathology

M89.60 — Osteopathy after poliomyelitis, unspecified site - lacks anatomic specificity

M85.80 — Other specified disorders of bone density and structure, unspecified site - not specifically post-polio

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 M89.659 an HCC code?

Yes. M89.659 (Osteopathy after poliomyelitis, unspecified thigh) 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: M89.659 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: M89.659
Description: Osteopathy after poliomyelitis, unspecified thigh
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 M89.659 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for M89.659

For M89.659 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 M89.659 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

M89.659 is the ICD-10-CM diagnosis code for osteopathy after poliomyelitis, unspecified thigh. Bone disease that develops as a complication of poliomyelitis affecting the thigh, but the specific side (left or right) is not documented or specified. M89.659 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, M89.659 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 M89.659; 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.

Use this code only when laterality cannot be determined from the medical record. Because M89.659 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 M89.659 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code only when laterality cannot be determined from the medical record
•Query the provider if possible to obtain specific laterality information for more precise coding

Clinical Significance

Osteopathy after poliomyelitis affecting the thigh represents a chronic complication of previous polio infection, potentially causing bone deformities and functional limitations. This diagnosis is significant for risk adjustment as it indicates ongoing orthopedic complications requiring specialized care and monitoring for progression.

Documentation Requirements

✓Clear documentation of history of poliomyelitis infection
✓Evidence of osteopathy (bone disease) affecting the thigh region
✓Specification that laterality (right or left) is not documented or determinable
✓Clinical symptoms related to bone changes in the thigh area
✓Imaging studies showing bone abnormalities consistent with post-polio osteopathy
✓Documentation of functional impact on mobility or activities
✓Provider assessment of the relationship between current bone condition and prior polio
✓Evidence that this represents a sequela of poliomyelitis rather than acute condition

Commonly Confused Codes

•M89.651/M89.652: Osteopathy after poliomyelitis, right/left thigh - when laterality is actually specified
•G14: Postpolio syndrome - neurological sequela rather than bone pathology
•M89.60: Osteopathy after poliomyelitis, unspecified site - lacks anatomic specificity
•M85.80: Other specified disorders of bone density and structure, unspecified site - not specifically post-polio
•Z87.891: Personal history of nicotine dependence - different type of history code