Alphabetic Index FY2027

M05.77

Rheumatoid arthritis with rheumatoid factor of ankle and foot without organ or systems involvement

FY2027Chapter 13: Diseases of the musculoskeletal system and connective tissue/M05–M14 Inflammatory polyarthropathies

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

M05.77 is a non-billable ICD-10-CM code header for rheumatoid arthritis with rheumatoid factor of ankle and foot without organ or systems involvement. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M05.771 Rheumatoid arthritis with rheumatoid factor of right ankle and foot without organ or systems involvement, M05.772 Rheumatoid arthritis with rheumatoid factor of left ankle and foot without organ or systems involvement and M05.779 Rheumatoid arthritis with rheumatoid factor of unspecified ankle and foot without organ or systems involvement. Its coding notes include 3 Excludes1 entries and 10 Excludes2 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from M05 Rheumatoid arthritis with rheumatoid factor
  • rheumatic fever (I00)
  • juvenile rheumatoid arthritis (M08.-)
  • rheumatoid arthritis of spine (M45.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (10 notes)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • 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)

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 2 entries

More specific codes under M05.77 3