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ICD-10-CM 2027 diagnosis code

M36.8Systemic disorders of connective tissue in other diseases classified elsewhere

✓ Billable / specificManifestation — not principal

M36.8 is a valid, billable ICD-10-CM code for systemic disorders of connective tissue in other diseases classified elsewhere. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Systemic disord of conn tiss in oth diseases classd elswhr

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M36.8

M36.8 is the ICD-10-CM diagnosis code for systemic disorders of connective tissue in other diseases classified elsewhere. It belongs to category M36 (systemic disorders of connective tissue in diseases classified elsewhere), block M30-M36 (systemic connective tissue disorders) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within M36, choose M36.8 (Systemic disorders of connective tissue in other diseases classified elsewhere) only when documentation doesn't support a more specific option: Dermato(poly)myositis in neoplastic disease (M36.0), arthropathy in neoplastic disease (M36.1), Hemophilic arthropathy (M36.2), arthropathy in other blood disorders (M36.3) and arthropathy in hypersensitivity reactions classified elsewhere (M36.4).

Code first underlying disease, such as: alkaptonuria (E70.29), hypogammaglobulinemia (D80.-) and ochronosis (E70.29).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 545 (Connective Tissue Disorders with MCC, relative weight 2.3892), DRG 546 (Connective Tissue Disorders with CC, relative weight 1.1745) and DRG 547 (Connective Tissue Disorders without CC/MCC, relative weight 0.7526), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 710.9 (unspecified diffuse connective tissue disease).

Coding notes

Code firstSequence the underlying condition first
  • underlying disease, such as:
  • alkaptonuria (E70.29)
  • hypogammaglobulinemia (D80.-)
  • ochronosis (E70.29)

Notes that apply from higher levels

Instructions written at a parent level also apply to M36.8.

› From M36 Systemic disorders of connective tissue in diseases classified elsewhere
Excludes2
  • arthropathies in diseases classified elsewhere (M14.-)

Broader instructions also apply from M30-M36 Systemic connective tissue disorders and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 710.9Unspecified diffuse connective tissue diseaseapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about M36.8

Is M36.8 billable?

Yes. M36.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M36.8 be used as a principal diagnosis?

No. It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

Is M36.8 a CC or MCC?

No. M36.8 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M36.8 group to?

M36.8 is used in the MS-DRG v44.0 logic for MS-DRG 545 (Connective Tissue Disorders with MCC), MS-DRG 546 (Connective Tissue Disorders with CC) and MS-DRG 547 (Connective Tissue Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for M36.8?

The CMS General Equivalence Mappings map M36.8 to ICD-9-CM 710.9.