2026 ICD-10-CM Diagnosis Code M72.9Fibroblastic disorder, unspecified

ICD-10-CM Codes›M00–M99›M70-M79›M72

ICD-10-CM M72.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M72.9 is a billable ICD-10-CM diagnosis code for fibroblastic disorder, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 557 through 558. Coders also document this condition as abscess of abdominal wall. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified connective tissue disease.

Code Identity

ICD-10-CM Code
M72.9
Billable Status
Yes — Valid for Submission
Code Describes
Fibroblastic disorder, unspecified
Short Description
Fibroblastic disorder, unspecified
Same as the full description in the CMS dataset.
Parent Code
M72
Fibroblastic disorders

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM72Fibroblastic disorders
This CodeM72.9Fibroblastic disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess of abdominal wall
  • Cranial fasciitis
  • Disorder of rectus sheath
  • Fasciitis
  • Fibromatosis
  • Musculoskeletal fibromatosis
  • Nodular fasciitis
  • Rectus sheath abscess
  • Superficial fibromatosis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Fasciitis NOS
  • Fibromatosis NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disorder(of)
      • fibroblastic
    • Fasciitis
    • Fibromatosis

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS025
Other specified connective tissue disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Fasciitis

    inflammation of the fascia. there are three major types: 1, eosinophilic fasciitis, an inflammatory reaction with eosinophilia, producing hard thickened skin with an orange-peel configuration suggestive of scleroderma and considered by some a variant of scleroderma; 2, necrotizing fasciitis (fasciitis, necrotizing), a serious fulminating infection (usually by a beta hemolytic streptococcus) causing extensive necrosis of superficial fascia; 3, nodular/pseudosarcomatous /proliferative fasciitis, characterized by a rapid growth of fibroblasts with mononuclear inflammatory cells and proliferating capillaries in soft tissue, often the forearm; it is not malignant but is sometimes mistaken for fibrosarcoma.

  • Fasciitis, Necrotizing

    a fulminating bacterial infection of the deep layers of the skin and fascia. it can be caused by many different organisms, with streptococcus pyogenes being the most common.

  • Fasciitis, Plantar

    inflammation of the plantar fascia (aponeurosis) on the bottom of the foot causing heel pain. the etiology of plantar fasciitis remains controversial but is likely to involve a biomechanical imbalance. though often presenting along with heel spur, they do not appear to be causally related.

  • Superficial Fibromatosis

    a poorly circumscribed, intermediate fibrocytic neoplasm arising from the superficial soft tissues. it is characterized by the presence of spindle-shaped fibroblasts, and an infiltrative growth pattern.

Patient EducationClinical

Connective Tissue Disorders

Your connective tissue supports many different parts of your body, such as your skin, eyes, and heart. It is like a "cellular glue" that gives your body parts their shape and helps keep them strong. It also helps some of your tissues do their work. It is made of many kinds of proteins. Cartilage and fat are types of connective tissue.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M72.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
728.79 Fibromatoses NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
729.4 Fasciitis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M72.9Overview

Is M72.9 (Fibroblastic disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report fibroblastic disorder, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M72.9 group to?

When fibroblastic disorder, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 557, 558, with relative weights from 0.8932 to 1.4869 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M72.9?

Under the General Equivalence Mappings, fibroblastic disorder, unspecified converts to ICD-9-CM 728.79 (fibromatoses NEC) and 729.4 (fasciitis NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.