ICD-10 Code for fibromyalgia
The ICD-10-CM code for fibromyalgia is M79.7 when documented without further specification. Fibromyalgia codes to M79.7, a single complete code with no laterality or further subdivision. It sits in the soft-tissue disorder category M79 alongside myalgia (M79.1-) and unspecified rheumatism (M79.0), which are distinct conditions.
Which Code Should You Use?
What to Document
- That fibromyalgia is the provider's documented diagnosis (versus generalized myalgia).
- Any localized muscle pain that is better captured as myalgia (M79.1-).
- Coexisting conditions (e.g., fatigue or mood disorders) when separately documented.
Common Documentation Pitfalls
- Coding widespread muscle pain as fibromyalgia (M79.7) when the provider documents only myalgia (M79.1-).
- M79.7 has no laterality or additional characters — do not seek a site-specific subcode.
Also Known As
Official ICD-10-CM Alphabetic Index terms that point to M79.7:
- Myofibrositis
- Fibromyalgia
- Fibromyositis
- Fibrositis (periarticular)
Coding Notes
M79.7 is a complete, billable code for fibromyalgia with no laterality. Distinguish it from myalgia (M79.1-), which is muscle pain without a fibromyalgia diagnosis. Code coexisting conditions separately when documented.