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M05.A - Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis

ICD-10-CM Chapter 13: Diseases of the musculoskeletal system and connective tissue · M05-M14 Inflammatory polyarthropathies (M05-M14) · Subcategory of M05 · FY2027

Includes, Excludes and Coding Notes

Code FirstFrom M05.A

Sequence the underlying condition before this code.

  • rheumatoid arthritis with rheumatoid factor by site, if known (M05.00 to M05.8A)
Excludes 1 — Not Coded HereFrom M05

Mutually exclusive: these conditions are never reported together with this code.

  • rheumatic fever (I00)
  • juvenile rheumatoid arthritis (M08.-)
  • rheumatoid arthritis of spine (M45.-)
Excludes 2 — Not Included HereFrom Chapter M00-M99

Not part of this code; report both codes when the patient has both conditions.

  • 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)
NotesFrom Chapter M00-M99

Instructional notes from the ICD-10-CM tabular list.

  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with M05.A.