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ICD-10-CM 2027 diagnosis code

M13.142Monoarthritis, not elsewhere classified, left hand

✓ Billable / specific

M13.142 is a valid, billable ICD-10-CM code for monoarthritis, not elsewhere classified, left hand. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 M13.142

M13.142 is the ICD-10-CM diagnosis code for monoarthritis, not elsewhere classified, left hand. It belongs to category M13 (other arthritis), block M05-M14 (inflammatory polyarthropathies) 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 M13.14 (monoarthritis, not elsewhere classified, hand), M13.142 is specifically for monoarthritis, not elsewhere classified, left hand. Related codes cover right hand (M13.141) and unspecified hand (M13.149).

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 553 (Bone Diseases and Arthropathies with MCC, relative weight 1.2494) and DRG 554 (Bone Diseases and Arthropathies without MCC, relative weight 0.8331), 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 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 716.64 (unspecified monoarthritis, hand).

Notes that apply from higher levels

Instructions written at a parent level also apply to M13.142.

› From M13 Other arthritis
Excludes1

Broader instructions also apply from 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.

MDC 08 · Diseases and Disorders of the Musculoskeletal System and Connective Tissue

ICD-9-CM equivalent

Converter →
  • 716.64Unspecified monoarthritis, handapproximate

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 M13.142

Is M13.142 billable?

Yes. M13.142 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M13.142 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M13.142 as a principal diagnosis.

Is M13.142 a CC or MCC?

No. M13.142 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M13.142 group to?

M13.142 is used in the MS-DRG v44.0 logic for MS-DRG 553 (Bone Diseases and Arthropathies with MCC) and MS-DRG 554 (Bone Diseases and Arthropathies without 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 M13.142?

The CMS General Equivalence Mappings map M13.142 to ICD-9-CM 716.64.