2026 ICD-10-CM Diagnosis Code M79.81Nontraumatic hematoma of soft tissue

ICD-10-CM Codes›M00–M99›M70-M79›M79

ICD-10-CM M79.81
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M79.81 is a billable ICD-10-CM diagnosis code for nontraumatic hematoma of soft tissue. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) 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

ICD-10-CM Code
M79.81
Billable Status
Yes — Valid for Submission
Code Describes
Nontraumatic hematoma of soft tissue
Short Description
Nontraumatic hematoma of soft tissue
Same as the full description in the CMS dataset.
Parent Code
M79.8
Other specified soft tissue disorders

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM79Other and unspecified soft tissue disorders, not elsewhere classified
This CodeM79.81Nontraumatic hematoma of soft tissue

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Colonic hematoma
  • Esophageal hematoma
  • Hematoma
  • Hematoma of scrotum
  • Hemorrhage of colon
  • Hemorrhage of muscle
  • Hemorrhage of scrotum
  • Intermuscular hematoma
  • Intramural esophageal hematoma
  • Intramuscular hematoma
  • Left lower limb amputation stump hematoma
  • Left upper limb amputation stump hematoma
  • Non-traumatic hematoma of skin and subcutaneous tissue
  • Nontraumatic hematoma of soft tissue
  • Nontraumatic intramuscular hematoma
  • Paroxysmal hematoma of the finger
  • Rectal hematoma
  • Right lower limb amputation stump hematoma
  • Right upper limb amputation stump hematoma
  • Scrotal hematoma due to non-traumatic cause
  • Subcutaneous dissecting hematoma
  • Subcutaneous hematoma

Tabular List NotesGuidance

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

Inclusion Terms

  • Nontraumatic hematoma of muscle
  • Nontraumatic seroma of muscle and soft tissue

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.

    • Hematoma(traumatic) (skin surface intact)
      • nontraumatic
        • muscle
    • Hematoma(traumatic) (skin surface intact)
      • nontraumatic
        • soft tissue

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

  • Aortic Intramural Hematoma

    an atypical form of aortic dissection in which subintimal dissection of the aortic tunica media without initial laceration of the aortic tunica intima. it may begin from a rupture of the vasa vasorum feeding aortic media.

  • Basal Ganglia Hemorrhage

    bleeding within the subcortical regions of cerebral hemispheres (basal ganglia). it is often associated with hypertension or arteriovenous malformations. clinical manifestations may include headache; dyskinesias; and hemiparesis.

  • Cerebral Hemorrhage, Traumatic

    bleeding into one or both cerebral hemispheres due to trauma. hemorrhage may involve any part of the cerebral cortex and the basal ganglia. depending on the severity of bleeding, clinical features may include seizures; aphasia; vision disorders; movement disorders; paralysis; and coma.

  • Hematoma

    a collection of blood outside the blood vessels. hematoma can be localized in an organ, space, or tissue.

  • Hematoma, Epidural, Cranial

    accumulation of blood in the epidural space between the skull and the dura mater, often as a result of bleeding from the meningeal arteries associated with a temporal or parietal bone fracture. epidural hematoma tends to expand rapidly, compressing the dura and underlying brain. clinical features may include headache; vomiting; hemiparesis; and impaired mental function.

  • Hematoma, Epidural, Spinal

    a rare epidural hematoma in the spinal epidural space, usually due to a vascular malformation (central nervous system vascular malformations) or trauma. spontaneous spinal epidural hematoma is a neurologic emergency due to a rapidly evolving compressive myelopathy.

  • Hematoma, Subdural

    accumulation of blood in the subdural space between the dura mater and the arachnoidal layer of the meninges. this condition primarily occurs over the surface of a cerebral hemisphere, but may develop in the spinal canal (hematoma, subdural, spinal). subdural hematoma can be classified as the acute or the chronic form, with immediate or delayed symptom onset, respectively. symptoms may include loss of consciousness, severe headache, and deteriorating mental status.

  • Hematoma, Subdural, Acute

    accumulation of blood in the subdural space with acute onset of neurological symptoms. symptoms may include loss of consciousness, severe headache, and deteriorating mental status.

  • Hematoma, Subdural, Chronic

    accumulation of blood in the subdural space with delayed onset of neurological symptoms. symptoms may include loss of consciousness, severe headache, and deteriorating mental status.

  • Hematoma, Subdural, Intracranial

    accumulation of blood in the subdural space over the cerebral hemisphere.

  • Hematoma, Subdural, Spinal

    subdural hematoma of the spinal canal.

  • Intracranial Hemorrhage, Traumatic

    bleeding within the skull induced by penetrating and nonpenetrating traumatic injuries, including hemorrhages into the tissues of cerebrum; brain stem; and cerebellum; as well as into the epidural, subdural and subarachnoid spaces of the meninges.

  • Blood Vessels

    any of the tubular vessels conveying the blood (arteries, arterioles, capillaries, venules, and veins).

  • Spinal Canal

    the cavity within the spinal column through which the spinal cord passes.

Convert M79.81 to ICD-9-CMHistory

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

ICD-9-CM
729.92 Nontrauma hema soft tiss
Exact Match The mapping is direct, with no qualifiers.

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 M79.81Overview

Is M79.81 (Other specified soft tissue disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report nontraumatic hematoma of soft tissue on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M79.81 group to?

When nontraumatic hematoma of soft tissue is the principal diagnosis on an inpatient stay, it groups to MS-DRG 555, 556, with relative weights from 0.8306 to 1.3218 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M79.81?

Under the General Equivalence Mappings, nontraumatic hematoma of soft tissue converts to ICD-9-CM 729.92 (nontrauma hema soft tiss). The mapping is a direct match.

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.