2027 ICD-10-CM Diagnosis Code M79.7Fibromyalgia
ICD-10-CM Codes›M00–M99›M70-M79›M79
- Billable — Valid for Submission
- Chronic Condition
M79.7 is a billable ICD-10-CM diagnosis code for fibromyalgia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 555 through 556. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified connective tissue disease.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Fibromyalgia
- Fibromyositis
- Fibrositis
- Fibrositis and nodular fasciitis
- Fibrositis of neck
- Fibrositis of upper arm
- Fibrositis of upper limb
- Inflammation of muscle of upper arm
- Muscular rheumatism
- Pain in muscle of upper arm
- Pain in upper arm
- Primary fibromyalgia syndrome
- Primary fibrositis
- Scapulohumeral fibrositis
- Secondary fibrositis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M79.7: its own notes plus those printed at M79 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Fibromyositis
- Fibrositis
- Myofibrositis
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- 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
General instructions on how these codes are used.
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name M79.7, its category, or a range that includes it.
Excludes1 4
These codes carry an Excludes1 note naming M79.7: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Fibromyalgia M79.7
Fibromyositis M79.7
Myofibrositis M79.7
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Fibromyalgia
a common nonarticular rheumatic syndrome characterized by myalgia and multiple points of focal muscle tenderness to palpation (trigger points). muscle pain is typically aggravated by inactivity or exposure to cold. this condition is often associated with general symptoms, such as sleep disturbances, fatigue, stiffness, headaches, and occasionally depression. there is significant overlap between fibromyalgia and the chronic fatigue syndrome (fatigue syndrome, chronic). fibromyalgia may arise as a primary or secondary disease process. it is most frequent in females aged 20 to 50 years. (from adams et al., principles of neurology, 6th ed, p1494-95)
Patient EducationClinical
Fibromyalgia
Fibromyalgia is chronic (long-lasting) condition that causes pain all over the body, fatigue, and other symptoms. There is no cure, but treatments can help with the symptoms.
The full article covers:
- What causes fibromyalgia?
- Who is at risk for fibromyalgia?
- What are the symptoms of fibromyalgia?
- How is fibromyalgia diagnosed?
- What are the treatments for fibromyalgia?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M79.7 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M79.7Overview
What is the ICD-10 code for fibromyalgia?
The ICD-10-CM code for fibromyalgia is M79.7 (sometimes written as M797). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M79.7 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report fibromyalgia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M79.7 group to?
When fibromyalgia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 555, 556, with relative weights from 0.8210 to 1.2908 depending on complications. Higher weights mean higher Medicare reimbursement.
Can M79.7 be reported with F45.8?
Not as a rule. The Excludes1 note at M79, which applies to M79.7, lists "psychogenic rheumatism (F45.8)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of M79.7?
Under the General Equivalence Mappings, fibromyalgia converts to ICD-9-CM 729.1 (myalgia and myositis NOS). The mapping is approximate, so confirm the match fits the documentation.
