M01.X62 ICD-10-CM Code: Direct infection of left knee in infectious and parasitic diseases classified elsewhere
M01.X62 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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FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Infectious arthropathies (M00-M02)
M01.X62
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceDirect infection of left knee in infectious and parasitic diseases classified elsewhere
An infection in the left knee joint caused by a disease classified elsewhere, such as tuberculosis or a parasitic infection.
Buddy Insight
Direct infection of the left knee joint resulting from infectious or parasitic diseases classified elsewhere represents a critical condition requiring immediate and comprehensive treatment.
CMS-HCC V28
MappedHCC 92
Coefficient HCC 92: 0.479 (Community Non-Dual Aged (CNA))
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 055
Code-level coefficient reference
ESRD/PACE
MappedHCC 39
Code-level coefficient reference
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for M01.X62. 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
Includes
OfficialNo Includes notes are included in this display for M01.X62. Check the code and parent instructions in the Code Book.
Excludes 1
Official- arthropathy in Lyme disease (A69.23)Inherited from M01
- gonococcal arthritis (A54.42)Inherited from M01
- meningococcal arthritis (A39.83)Inherited from M01
- mumps arthritis (B26.85)Inherited from M01
- postinfective arthropathy (M02.-)Inherited from M01
- postmeningococcal arthritis (A39.84)Inherited from M01
- reactive arthritis (M02.3)Inherited from M01
- rubella arthritis (B06.82)Inherited from M01
- sarcoidosis arthritis (D86.86)Inherited from M01
- typhoid fever arthritis (A01.04)Inherited from M01
- tuberculosis arthritis (A18.01-A18.02)Inherited from M01
Code First
Official- underlying disease, such as:Inherited from M01
- leprosy [Hansen's disease] (A30.-)Inherited from M01
- mycoses (B35-B49)Inherited from M01
- O'nyong-nyong fever (A92.1)Inherited from M01
- paratyphoid fever (A01.1-A01.4)Inherited from M01
Use Additional
OfficialNo Use Additional Code instructions are included in this display for M01.X62. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for M01.X62. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 M01.X62 an HCC code?
Yes. M01.X62 (Direct infection of left knee in infectious and parasitic diseases classified elsewhere) 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: M01.X62 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
- M01.X62
- Description
- Direct infection of left knee in infectious and parasitic diseases classified elsewhere
- 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
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 M01.X62 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for M01.X62
For M01.X62, 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
M01.X62 is the ICD-10-CM diagnosis code for direct infection of left knee in infectious and parasitic diseases classified elsewhere. An infection in the left knee joint caused by a disease classified elsewhere, such as tuberculosis or a parasitic infection. M01.X62 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering infectious arthropathies (m00-m02).
Under the CMS-HCC V28 risk adjustment model, M01.X62 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 specific underlying infectious disease to support accurate secondary code assignment. For M01.X62, 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 M01.X62 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document the specific underlying infectious disease to support accurate secondary code assignment
- •This code indicates the knee infection is a direct manifestation of another classified infectious condition
Clinical Significance
Direct infection of the left knee joint resulting from infectious or parasitic diseases classified elsewhere represents a critical condition requiring immediate and comprehensive treatment. The knee's role in mobility and weight-bearing makes this infection particularly concerning for functional outcomes and quality of life.
Documentation Requirements
- ✓Specific documentation of left knee joint infection
- ✓Primary code for underlying infectious or parasitic disease (A00-B99)
- ✓Clear evidence that knee infection is direct result of classified disease
- ✓Clinical assessment documenting knee joint inflammation and mobility impairment
- ✓Laboratory evidence supporting infectious process and systemic inflammation
- ✓Radiographic studies confirming knee joint involvement
- ✓Synovial fluid analysis from knee aspiration when performed
- ✓Comprehensive treatment plan for both systemic and local knee infection
Commonly Confused Codes
- •M00.962: Pyogenic arthritis, left knee (routine bacterial knee infection)
- •M25.562: Pain in left knee (joint symptoms without infectious cause)
- •M01.X61: Direct infection of right knee in infectious diseases classified elsewhere
- •M23.92: Unspecified internal derangement of left knee (mechanical problem)