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ICD-10-CM 2027 diagnosis code

M00.80Arthritis due to other bacteria, unspecified joint

✓ Billable / specificCC — complication/comorbidityUnspecified — edit

M00.80 is a valid, billable ICD-10-CM code for arthritis due to other bacteria, unspecified joint. 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 M00.80

M00.80 is the ICD-10-CM diagnosis code for arthritis due to other bacteria, unspecified joint. It belongs to category M00 (pyogenic arthritis), block M00-M02 (infectious arthropathies) 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 M00.8, choose M00.80 (Arthritis due to other bacteria, unspecified joint) only when documentation doesn't support a more specific option: arthritis due to other bacteria, shoulder (M00.81), arthritis due to other bacteria, elbow (M00.82), arthritis due to other bacteria, wrist (M00.83), arthritis due to other bacteria, hand (M00.84), arthritis due to other bacteria, hip (M00.85), arthritis due to other bacteria, knee (M00.86), arthritis due to other bacteria, ankle and foot (M00.87), arthritis due to other bacteria, vertebrae (M00.88) and 1 more.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 548 (Septic Arthritis with MCC, relative weight 1.9519), DRG 549 (Septic Arthritis with CC, relative weight 1.1435) and DRG 550 (Septic Arthritis without CC/MCC, relative weight 0.8591), 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 an unspecified code for which a more specific option (often laterality) exists, and the Medicare Code Editor flags it for review on inpatient claims.

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 041.89 (other specified bacterial infections in conditions classified elsewhere and of unspecified site, other specified bacteria), 711.00 (pyogenic arthritis, site unspecified) and 711.00 (pyogenic arthritis, site unspecified).

Notes that apply from higher levels

Instructions written at a parent level also apply to M00.80.

› From M00.8 Arthritis and polyarthritis due to other bacteria
Use additional code
  • code (B96) to identify bacteria
› From M00 Pyogenic arthritis
Excludes2
  • infection and inflammatory reaction due to internal joint prosthesis (T84.5-)

Broader instructions also apply from M00-M02 Infectious arthropathies and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to M00.80.

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 →
  • 041.89Other specified bacterial infections in conditions classified elsewhere and of unspecified site, other specified bacteriaapproximate, combination
  • 711.00Pyogenic arthritis, site unspecifiedapproximate
  • 711.00Pyogenic arthritis, site unspecifiedapproximate, combination

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 M00.80

Is M00.80 billable?

Yes. M00.80 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M00.80 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M00.80 as a principal diagnosis.

Is M00.80 a CC or MCC?

M00.80 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does M00.80 group to?

M00.80 is used in the MS-DRG v44.0 logic for MS-DRG 548 (Septic Arthritis with MCC), MS-DRG 549 (Septic Arthritis with CC) and MS-DRG 550 (Septic Arthritis 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 M00.80?

The CMS General Equivalence Mappings map M00.80 to ICD-9-CM 041.89, 711.00 and 711.00.