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M14.662 ICD-10-CM Code: Charcôt's joint, left knee

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

  • MS-DRG 553 — BONE DISEASES AND ARTHROPATHIES WITH MCC (MDC 08)
  • MS-DRG 554 — BONE DISEASES AND ARTHROPATHIES WITHOUT MCC (MDC 08)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Official Registry Overview & Definition

Charcôt's joint, left knee is a billable ICD-10-CM diagnosis code (M14.662).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for M14.662 in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Frequently Compared Codes

The official Excludes notes on M14.662 name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Relationships & Classification

Other codes that name M14.662 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

1 Excludes2 notes: M36 (via M14.-).

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 2 MS-DRGs: DRG 553 (MDC 08), DRG 554 (MDC 08).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):MUS032 — Neurogenic/neuropathic arthropathy (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same condition, opposite side

Same category and title, differing only in which side of the body is affected.

M14.661 — Charcôt's joint, right knee (right)Compare M14.662 vs M14.661 →, M14.669 — Charcôt's joint, unspecified knee (unspecified)Compare M14.662 vs M14.669 →

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Neurogenic/neuropathic arthropathy).

M14.619 — Charcôt's joint, unspecified shoulder, M14.621 — Charcôt's joint, right elbow, M14.622 — Charcôt's joint, left elbow, M14.629 — Charcôt's joint, unspecified elbow, M14.631 — Charcôt's joint, right wrist, M14.632 — Charcôt's joint, left wrist, M14.639 — Charcôt's joint, unspecified wrist, M14.641 — Charcôt's joint, right hand, M14.642 — Charcôt's joint, left hand, M14.649 — Charcôt's joint, unspecified hand, M14.651 — Charcôt's joint, right hip, M14.652 — Charcôt's joint, left hip, M14.659 — Charcôt's joint, unspecified hip, M14.661 — Charcôt's joint, right knee, M14.669 — Charcôt's joint, unspecified knee, M14.671 — Charcôt's joint, right ankle and foot, M14.672 — Charcôt's joint, left ankle and foot, M14.679 — Charcôt's joint, unspecified ankle and foot, M14.68 — Charcôt's joint, vertebrae, M14.69 — Charcôt's joint, multiple sites, +4 more

Contextual Map

Every relationship of M14.662 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • M00-M99 — Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) (M00-M99) [Hierarchy]
  • M00-M25 — Arthropathies [Hierarchy]
  • M05-M14 — Inflammatory polyarthropathies [Hierarchy]

Referenced by Excludes2 notes

  • M36 — Systemic disorders of connective tissue in diseases classified elsewhere [Excludes2](via M14.-): “arthropathies in diseases classified elsewhere (M14.-)” · check together

Clinical classification (CCSR)

  • MUS032 — Neurogenic/neuropathic arthropathy [CCSR]

Potential MS-DRG

  • DRG 553 — BONE DISEASES AND ARTHROPATHIES WITH MCC [MS-DRG]: “BONE DISEASES AND ARTHROPATHIES WITH MCC (MDC 08)”
  • DRG 554 — BONE DISEASES AND ARTHROPATHIES WITHOUT MCC [MS-DRG]: “BONE DISEASES AND ARTHROPATHIES WITHOUT MCC (MDC 08)”

MDC crossing · procedures (18508)

  • MDC 08 — Diseases and Disorders of the Musculoskeletal System and Connective Tissue [MDC crossing]: “Diseases and Disorders of the Musculoskeletal System and Connective Tissue — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”
  • 005T0ZZ — Destruction of Spinal Meninges, Open Approach [Same-MDC procedure]: “Destruction of Spinal Meninges, Open Approach — grouped in MDC 08, the procedure side of this code's crossing.” · check together
  • 005T3ZZ — Destruction of Spinal Meninges, Percutaneous Approach [Same-MDC procedure]: “Destruction of Spinal Meninges, Percutaneous Approach — grouped in MDC 08, the procedure side of this code's crossing.” · check together
  • 005T4ZZ — Destruction of Spinal Meninges, Percutaneous Endoscopic Approach [Same-MDC procedure]: “Destruction of Spinal Meninges, Percutaneous Endoscopic Approach — grouped in MDC 08, the procedure side of this code's crossing.” · check together
  • 005W0Z3 — Destruction of Cervical Spinal Cord using Laser Interstitial Thermal Therapy, Open Approach [Same-MDC procedure]: “Destruction of Cervical Spinal Cord using Laser Interstitial Thermal Therapy, Open Approach — grouped in MDC 08, the procedure side of this code's crossing.” · check together
  • 005W0ZZ — Destruction of Cervical Spinal Cord, Open Approach [Same-MDC procedure]: “Destruction of Cervical Spinal Cord, Open Approach — grouped in MDC 08, the procedure side of this code's crossing.” · check together
  • and 18503 more

Nearest codes (40)

  • M14 — Arthropathies in other diseases classified elsewhere [Sibling]
  • M14.612 — Charcôt's joint, left shoulder [Sibling]
  • M14.619 — Charcôt's joint, unspecified shoulder [Sibling]
  • M14.62 — Charcôt's joint, elbow [Sibling]
  • M14.621 — Charcôt's joint, right elbow [Sibling]
  • M14.622 — Charcôt's joint, left elbow [Sibling]
  • M14.629 — Charcôt's joint, unspecified elbow [Sibling]
  • M14.63 — Charcôt's joint, wrist [Sibling]
  • and 32 more

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M14.662 in its code family, with their registry titles.

  • M14.651 — Charcôt's joint, right hip
  • M14.652 — Charcôt's joint, left hip
  • M14.659 — Charcôt's joint, unspecified hip
  • M14.66 — Charcôt's joint, knee
  • M14.661 — Charcôt's joint, right knee
  • M14.669 — Charcôt's joint, unspecified knee
  • M14.67 — Charcôt's joint, ankle and foot
  • M14.671 — Charcôt's joint, right ankle and foot
  • M14.672 — Charcôt's joint, left ankle and foot
  • M14.679 — Charcôt's joint, unspecified ankle and foot

View all codes in the M14 family