M79.7 Fibromyalgia

Billable ICD-10-CM code, FY2026.

Applicable to

• Fibromyositis
• Fibrositis
• Myofibrositis

Applies from M79 Other and unspecified soft tissue disorders, not elsewhere classified

Excludes1 (never code together)

• psychogenic rheumatism (F45.8)
• soft tissue pain, psychogenic (F45.41)

MS-DRG index

Defines the logic of DRG(s) 555-556 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 729.1 Myalgia and myositis, unspecified (approximate)

Code annotations containing back-references to M79.7

Back-references to M79.7

• Type 1 Excludes: M79.0 Rheumatism, unspecified ("fibromyalgia (M79.7)")
• Type 1 Excludes: M79.1 Myalgia ("fibromyalgia (M79.7)")
• Type 1 Excludes: M79.A Nontraumatic compartment syndrome ("fibromyalgia (M79.7)")
• Type 1 Excludes: T79.A Traumatic compartment syndrome ("fibromyalgia (M79.7)")

Diagnosis Index entries for M79.7

• Fibromyalgia
• Fibromyositis
• Fibrositis (periarticular)
• Myofibrositis

Nearby codes

• M79.672 Pain in left foot
• M79.673 Pain in unspecified foot
• M79.674 Pain in right toe(s)
• M79.675 Pain in left toe(s)
• M79.676 Pain in unspecified toe(s)
• M79.7 Fibromyalgia (this code)
• M79.A Nontraumatic compartment syndrome
• M79.A1 Nontraumatic compartment syndrome of upper extremity
• M79.A11 Nontraumatic compartment syndrome of right upper extremity
• M79.A12 Nontraumatic compartment syndrome of left upper extremity
• M79.A19 Nontraumatic compartment syndrome of unspecified upper extremity