M14.662 (Charcôt's joint, left knee) compared with M36.3 (Arthropathy in other blood disorders), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Not coded here — these two are mutually exclusive.
“hematological disorders (M36.2-M36.3)”
An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.
Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a
Distinct conditions — both may be reported.
“arthropathies in diseases classified elsewhere (M14.-)”
An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.
Source: CMS ICD-10-CM tabular instructional notes
No — do not report together. M14.662 carries an Excludes1 note covering M36.3: “hematological disorders (M36.2-M36.3)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Yes, when both are documented. M36.3 carries an Excludes2 note covering M14.662: “arthropathies in diseases classified elsewhere (M14.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
| M14.662Charcôt's joint, left knee | M36.3Arthropathy in other blood disorders | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Charcôt's joint, left knee is a billable ICD-10-CM diagnosis code (M14.662). | Arthropathy in other blood disorders is a billable ICD-10-CM diagnosis code (M36.3). |
| Includes | — | autoimmune disease NOS collagen (vascular) disease NOS systemic autoimmune disease systemic collagen (vascular) disease |
| Code first | — | underlying disease, such as: disease of blood and blood-forming organs, unspecified (D75.9) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources