M00

Non-Billable
ChapterM00–M99
Rankcategory
Official Description

Pyogenic arthritis

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).

CH13 Parent Instructions

Excludes2(Not included here)
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Instructional Notes

Excludes2(Not included here)
  • infection and inflammatory reaction due to internal joint prosthesis (T84.5-)

Clinical Hierarchy

CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M00-M02Infectious arthropathies (M00-M02)
M00Pyogenic arthritis
M00.0Staphylococcal arthritis and polyarthritis
M00.1Pneumococcal arthritis and polyarthritis
M00.2Other streptococcal arthritis and polyarthritis
M00.8Arthritis and polyarthritis due to other bacteria
M00.9Pyogenic arthritis, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M00:

chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to M00. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths
Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)1 unique routes
knee
joint→M00
Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)24 unique routes
in (due to)
Hemophilus influenzae→M00
pneumococcal→M00(10 variants)
ankle→M00
elbow→M00
hand joint→M00
hip→M00
knee→M00
multiple site→M00
shoulder→M00
vertebra→M00
wrist→M00
pyogenic or pyemic (any site except spine)→M00(11 variants)
bacterial NEC→M00(10 variants)
ankle→M00
elbow→M00
hand joint→M00
hip→M00
knee→M00
multiple site→M00
shoulder→M00
vertebra→M00
wrist→M00
staphylococcal→M00(2 variants)
ankle→M00

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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