ICD10Check
CheckerBrowseOpen

M05.0

⚠ Non-billable (Header)

Felty's syndrome

Diseases of the musculoskeletal system and connective tissue (M00-M99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

Check This Code

Also Known As

Rheumatoid arthritis with splenoadenomegaly and leukopenia

❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

M05
  • • rheumatic fever (I00)
  • • juvenile rheumatoid arthritis (M08.-)
  • • rheumatoid arthritis of spine (M45.-)

Child Codes (9)

M05.00Felty's syndrome, unspecified siteM05.01Felty's syndrome, shoulderM05.02Felty's syndrome, elbowM05.03Felty's syndrome, wristM05.04Felty's syndrome, handM05.05Felty's syndrome, hipM05.06Felty's syndrome, kneeM05.07Felty's syndrome, ankle and footM05.09Felty's syndrome, multiple sites

Clinical Description

ICD-10-CM code M05.0 represents felty's syndrome. This code falls under the Diseases of the musculoskeletal system and connective tissue (M00-M99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 5-character code at the 4th level of specificity. There are 9 more specific child codes under M05.0. Coders should note that M05.0 has 3 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code M05.0?

ICD-10-CM code M05.0 is "Felty's syndrome". It belongs to the category: Diseases of the musculoskeletal system and connective tissue (M00-M99).

Is M05.0 a billable ICD-10 code?

No, M05.0 is a non-billable header code. A more specific child code must be used for billing.

What codes are excluded with M05.0?

M05.0 has 3 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Related Codes in M05

Other codes in the same category that may be relevant for differential coding:

M05.1Rheumatoid lung disease with rheumatoid arthritisM05.2Rheumatoid vasculitis with rheumatoid arthritisM05.3Rheumatoid heart disease with rheumatoid arthritisM05.4Rheumatoid myopathy with rheumatoid arthritisM05.5Rheumatoid polyneuropathy with rheumatoid arthritisM05.6Rheumatoid arthritis with involvement of other organs and systemsM05.7Rheumatoid arthritis with rheumatoid factor without organ or systems involvementM05.8Other rheumatoid arthritis with rheumatoid factorM05.9Rheumatoid arthritis with rheumatoid factor, unspecifiedM05.AAbnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis

🧪 Validate Combinations

Add M05.0 to the Excludes Checker to validate against your full code list.

Open in Checker →

Code Information

CodeM05.0
BillableNo — Header code
ParentM05
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes13 rule(s)
Excludes20 note(s)
Child codes9

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)