All ICD10 Codes

M05.66

Non-Billable
ChapterM00–M99
Ranksubcategory
Official Description

Rheumatoid arthritis of knee with involvement of other organs and systems

Use a more specific code (3 billable)
M05.661Rheumatoid arthritis of right knee with involvement of other organs and systemsM05.662Rheumatoid arthritis of left knee with involvement of other organs and systemsM05.669Rheumatoid arthritis of unspecified knee with involvement of other organs and systems
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).
General instructions are available for the parent sections:
View CH13 NotesView M05 Notes

Clinical Hierarchy

BillableHas subcodes
CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M05-M14Inflammatory polyarthropathies (M05-M14)
M05Rheumatoid arthritis with rheumatoid factor
M05.6Rheumatoid arthritis with involvement of other organs and systems
M05.66Rheumatoid arthritis of knee with involvement of other organs and systemsNot billable
M05.661Rheumatoid arthritis of right knee with involvement of other organs and systemsBillable
M05.662Rheumatoid arthritis of left knee with involvement of other organs and systemsBillable
M05.669Rheumatoid arthritis of unspecified knee with involvement of other organs and systemsBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M05.66:

categoryM05
Rheumatoid arthritis with rheumatoid factor
View context instructions
chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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