M89.662 maps to CMS-HCC V28 92. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software

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Code lookupM89.662

Effective 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)

M89.662

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

Osteopathy after poliomyelitis, left lower leg

Bone disease that develops as a complication of poliomyelitis affecting the left lower leg, causing weakening or deformity of the bone in that area.

Buddy Insight

Left lower leg osteopathy after poliomyelitis represents a chronic skeletal complication from previous polio infection, with potential for progressive bone deformities and functional limitations.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 92

Bone/Joint/Muscle/Severe Soft...

Coefficient HCC 92: 0.479 (Community Non-Dual Aged (CNA))

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 M89.66Osteopathy after poliomyelitis, lower leg M89.662Osteopathy after poliomyelitis, left lower leg

Inclusion Terms

Official

No inclusion terms are included in this display for M89.662. Check the code and parent instructions in the Code Book.

Excludes 2

Official

arthropathic psoriasis (L40.5-)Inherited from M00-M99
certain conditions originating in the perinatal period (P04-P96)Inherited from M00-M99
certain infectious and parasitic diseases (A00-B99)Inherited from M00-M99
compartment syndrome (traumatic) (T79.A-)Inherited from M00-M99
complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from M00-M99
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from M00-M99
endocrine, nutritional and metabolic diseases (E00-E88)Inherited from M00-M99
injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from M00-M99
neoplasms (C00-D49)Inherited from M00-M99
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from M00-M99

Related Codes

Official

M89.661Osteopathy after poliomyelitis, right lower leg M89.669Osteopathy after poliomyelitis, unspecified lower leg

Includes

Official

No Includes notes are included in this display for M89.662. Check the code and parent instructions in the Code Book.

Excludes 1

Official

postprocedural osteopathies (M96.-)Inherited from M86-M90, M89.6
postpolio syndrome (G14)Inherited from M86-M90, M89.6

Code First

Official

No Code First sequencing instructions are included in this display for M89.662. Check the code and parent instructions in the Code Book.

Use Additional

Official

code (B91) to identify previous poliomyelitisInherited from M89.6

Code Also

Official

No Code Also instructions are included in this display for M89.662. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Clear documentation of history of poliomyelitis infection

Evidence of osteopathy specifically affecting the left lower leg

Clinical symptoms of bone changes, weakness, or deformity in left lower leg

Imaging confirmation of bone abnormalities consistent with post-polio osteopathy

MEAT Support

HCC Buddy guidance

Clear documentation of history of poliomyelitis infection

Evidence of osteopathy specifically affecting the left lower leg

Clinical symptoms of bone changes, weakness, or deformity in left lower leg

Imaging confirmation of bone abnormalities consistent with post-polio osteopathy

Audit Caution

HCC Buddy guidance

Confusing right and left laterality in documentation review

Using postpolio syndrome for bone rather than neurological manifestations

Failing to document clear relationship between bone condition and prior polio

Not confirming left lower leg anatomic specificity

Common Mistakes

HCC Buddy guidance

M89.661 — Osteopathy after poliomyelitis, right lower leg - incorrect laterality

M89.669 — Osteopathy after poliomyelitis, unspecified lower leg - when laterality is actually documented

G14 — Postpolio syndrome - neurological manifestation rather than bone pathology

M21.062 — Valgus deformity, not elsewhere classified, left lower leg - specific deformity code rather than post-polio osteopathy

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 M89.662 an HCC code?

Yes. M89.662 (Osteopathy after poliomyelitis, left lower leg) 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: M89.662 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: M89.662
Description: Osteopathy after poliomyelitis, left lower leg
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 M89.662 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for M89.662

For M89.662, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

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

Coder workflow notes

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What This Code Means

M89.662 is the ICD-10-CM diagnosis code for osteopathy after poliomyelitis, left lower leg. Bone disease that develops as a complication of poliomyelitis affecting the left lower leg, causing weakening or deformity of the bone in that area. M89.662 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, M89.662 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. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. 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.

Document the history of poliomyelitis in the patient record to support this post-polio complication code. For M89.662, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. 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 M89.662 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document the history of poliomyelitis in the patient record to support this post-polio complication code
•The fifth character '2' indicates left side; verify laterality is clearly documented

Clinical Significance

Left lower leg osteopathy after poliomyelitis represents a chronic skeletal complication from previous polio infection, with potential for progressive bone deformities and functional limitations. This diagnosis is significant for risk adjustment as it indicates ongoing specialized orthopedic care needs and monitoring requirements.

Documentation Requirements

✓Clear documentation of history of poliomyelitis infection
✓Evidence of osteopathy specifically affecting the left lower leg
✓Clinical symptoms of bone changes, weakness, or deformity in left lower leg
✓Imaging confirmation of bone abnormalities consistent with post-polio osteopathy
✓Provider assessment establishing connection between current condition and prior polio
✓Documentation of functional impact on mobility and activities
✓Evidence that this represents a late sequela of poliomyelitis
✓Assessment of disease progression and treatment needs

Commonly Confused Codes

•M89.661: Osteopathy after poliomyelitis, right lower leg - incorrect laterality
•M89.669: Osteopathy after poliomyelitis, unspecified lower leg - when laterality is actually documented
•G14: Postpolio syndrome - neurological manifestation rather than bone pathology
•M21.062: Valgus deformity, not elsewhere classified, left lower leg - specific deformity code rather than post-polio osteopathy
•M89.9: Disorder of bone, unspecified - lacks specificity to post-polio etiology