2026 ICD-10-CM Diagnosis Code M35.7Hypermobility syndrome
ICD-10-CM Codes›M00–M99›M30-M36›M35
- Billable — Valid for Submission
- Not Chronic
M35.7 is a billable ICD-10-CM diagnosis code for hypermobility syndrome. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Systemic lupus erythematosus and connective tissue disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Foot joint hypermobility
- Generalized benign joint hypermobility
- Hypermobility syndrome
- Laxity of ligament
- Local disease
- Localized benign joint hypermobility
- Marfanoid joint hypermobility syndrome
- Marfan's syndrome
- Metatarsophalangeal joint hypermobility
- Musculoskeletal alteration
- Musculoskeletal hypermobility
- Scoliosis in skeletal dysplasia
- Spondyloepimetaphyseal dysplasia with joint laxity Beighton type
- Spondyloepimetaphyseal dysplasia with joint laxity, EXOC6B type
- Spondyloepiphyseal dysplasia with joint laxity
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Familial ligamentous laxity
Type 1 Excludes
- ligamentous laxity, NOS M24.2
Type 2 Excludes
- Ehlers-Danlos syndromes Q79.6
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Hypermobility, hypermotility
- syndrome - M35.7
- Lax, laxity - See Also: Relaxation;
- ligament (ous) - See Also: Disorder, ligament;
- familial - M35.7
- Syndrome - See Also: Disease;
- hypermobility - M35.7
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Hypermobility, hypermotility
- syndrome
- Lax, laxity
- ligament (ous)
- familial
- Syndrome
- hypermobility
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 M35.7 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M35.7Overview
Is M35.7 (Other systemic involvement of connective tissue) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report hypermobility syndrome on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does M35.7 group to?
When hypermobility syndrome 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 M35.7?
Under the General Equivalence Mappings, hypermobility syndrome converts to ICD-9-CM 728.5 (hypermobility syndrome). 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.
