Systemic disorders of connective tissue in diseases classified elsewhere
In Systemic connective tissue disorders (M30-M36), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue
6 billable codes under M36: 1 is a CC; 1 map to HCC 93 (Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.
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Instructional notes
Excludes2: not included here, code separately if applicable
- arthropathies in diseases classified elsewhere (M14.-)
Also applies, from Systemic connective tissue disorders (M30-M36)
These notes sit on M30-M36 and apply to every code under it, including M36.
Includes: conditions that are coded here
- autoimmune disease NOS
- collagen (vascular) disease NOS
- systemic autoimmune disease
- systemic collagen (vascular) disease
Excludes1: not coded here, use a different code
- autoimmune disease, single organ or single cell-type -code to relevant condition category
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.
- Site and laterality (page 60)
- Acute traumatic versus chronic or recurrent musculoskeletal conditions (page 61)
- Coding of Pathologic Fractures (page 61)
- Osteoporosis (page 61)
- Multisystem Inflammatory Syndrome (page 62)
All codes under M36
M36 can't be used on a claim. Pick a billable code below; grey headings group them.
- M36.0Dermato(poly)myositis in neoplastic disease
- M36.1Arthropathy in neoplastic disease
- M36.2Hemophilic arthropathy
- M36.3Arthropathy in other blood disorders
- M36.4Arthropathy in hypersensitivity reactions classified elsewhere
- M36.8Systemic disorders of connective tissue in other diseases classified elsewhere
M36 MS-DRGs
As the principal diagnosis, the billable codes under M36 group to MS-DRG 553, 554, 545, 546, or 547 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 553 Bone Diseases and Arthropathies with MCC (4 of 6 codes)
- DRG 554 Bone Diseases and Arthropathies without MCC (4 of 6 codes)
- DRG 545 Connective Tissue Disorders with MCC (2 of 6 codes)
- DRG 546 Connective Tissue Disorders with CC (2 of 6 codes)
- DRG 547 Connective Tissue Disorders without CC/MCC (2 of 6 codes)
Other codes that refer to M36
Notes on these codes point to M36.
- CH12 Excludes2: systemic connective tissue disorders (M30-M36)
- CH9 Excludes2: systemic connective tissue disorders (M30-M36)
- I77 Excludes2: collagen (vascular) diseases (M30-M36)
- J82 Excludes2: pulmonary eosinophilia due to systemic connective tissue disorders (M30-M36)
- J84.170 Code First: systemic connective tissue disorders (M30-M36)
- L94 Excludes1: systemic connective tissue disorders (M30-M36)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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 more about connective tissue disorders on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.