2027 ICD-10-CM Diagnosis Code M79.9Soft tissue disorder, unspecified
ICD-10-CM Codes›M00–M99›M70-M79›M79
- Billable — Valid for Submission
- Not Chronic
M79.9 is a billable ICD-10-CM diagnosis code for soft tissue disorder, unspecified. 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.
- Acute disease of musculoskeletal system
- Calcinosis following localized fat necrosis
- Chest wall lesion excised
- Chronic disease of musculoskeletal system
- Deformity of tissue
- Disorder of musculoskeletal system
- Disorder of soft tissue
- Disorder of soft tissue due to diabetes mellitus
- Disorder of soft tissue of abdominal cavity
- Disorder of soft tissue of body cavity
- Disorder of soft tissue of body wall region
- Disorder of soft tissue of head
- Disorder of soft tissue of limb
- Disorder of soft tissue of lower limb
- Disorder of soft tissue of neck
- Disorder of soft tissue of pelvis
- Disorder of soft tissue of thoracic cavity
- Disorder of soft tissue of trunk
- Disorder of soft tissue of upper limb
- Lesion of soft tissue
- Lesion of soft tissue of left knee region
- Lesion of soft tissue of right knee region
- Orthopedic disorders during pregnancy, childbirth and the puerperium
- Pelvic soft tissue abnormality in pregnancy, childbirth and the puerperium
- Soft tissue lesion of elbow region
- Soft tissue lesion of foot region
- Soft tissue lesion of knee region
- Soft tissue lesion of lower leg and ankle
- Soft tissue lesion of pelvic region
- Soft tissue lesion of wrist and hand
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M79.9: 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.
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disorder (of) See Also: Disease;
soft tissue M79.9
ankle M79.9
foot M79.9
forearm M79.9
hand M79.9
lower leg M79.9
multiple sites M79.9
pelvic region M79.9
shoulder region M79.9
thigh M79.9
upper arm M79.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Soft Tissue Disorder
a non-neoplastic or neoplastic disorder that affects the soft tissue.
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 M79.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M79.9Overview
What is the ICD-10 code for soft tissue disorder, unspecified?
The ICD-10-CM code for soft tissue disorder, unspecified is M79.9 (sometimes written as M799). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M79.9 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report soft tissue disorder, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M79.9 group to?
When soft tissue disorder, unspecified 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 M79.9 be reported with F45.8?
Not as a rule. The Excludes1 note at M79, which applies to M79.9, 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 M79.9?
Under the General Equivalence Mappings, soft tissue disorder, unspecified converts to ICD-9-CM 729.90 (soft tissue disord NOS). The mapping is approximate, so confirm the match fits the documentation.
