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ICD-10-CM 2027 diagnosis code

K63.8212Small intestinal bacterial overgrowth, hydrogen sulfide-subtype

✓ Billable / specific

K63.8212 is a valid, billable ICD-10-CM code for small intestinal bacterial overgrowth, hydrogen sulfide-subtype. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Small intestnl bact overgrowth, hydrogen sulfide-subtype

Code last changed in FY2024 (effective October 1, 2023). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K63.8212

K63.8212 is the ICD-10-CM diagnosis code for small intestinal bacterial overgrowth, hydrogen sulfide-subtype. It belongs to category K63 (other diseases of intestine), block K55-K64 (other diseases of intestines) and chapter 11 (diseases of the digestive system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within K63.821 (small intestinal bacterial overgrowth), K63.8212 is specifically for small intestinal bacterial overgrowth, hydrogen sulfide-subtype. Related codes cover hydrogen-subtype (K63.8211) and unspecified (K63.8219).

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 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), in MDC 06 (Diseases and Disorders of the Digestive System), 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 was added in FY2024, effective October 1, 2023.

Notes that apply from higher levels

Instructions written at a parent level also apply to K63.8212.

Broader instructions also apply from Chapter 11: Diseases of the digestive system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to K63.8212.

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.

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
  • FY2024 (effective 10/1/2023): Added
  • No changes since FY2024.

Common questions about K63.8212

Is K63.8212 billable?

Yes. K63.8212 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can K63.8212 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict K63.8212 as a principal diagnosis.

Is K63.8212 a CC or MCC?

No. K63.8212 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does K63.8212 group to?

K63.8212 is used in the MS-DRG v44.0 logic for MS-DRG 393 (Other Digestive System Diagnoses with MCC), MS-DRG 394 (Other Digestive System Diagnoses with CC) and MS-DRG 395 (Other Digestive System Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.