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ICD-10-CM 2027 diagnosis code

B82.9Intestinal parasitism, unspecified

✓ Billable / specific

B82.9 is a valid, billable ICD-10-CM code for intestinal parasitism, unspecified. 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 B82.9

B82.9 is the ICD-10-CM diagnosis code for intestinal parasitism, unspecified. It belongs to category B82 (unspecified intestinal parasitism), block B65-B83 (helminthiases) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within B82, choose B82.9 (parasitism, unspecified) only when documentation doesn't support a more specific option: helminthiasis, unspecified (B82.0).

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 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), 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 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 129 (intestinal parasitism, unspecified).

Notes that apply from higher levels

Instructions written at a parent level also apply to B82.9.

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

5 entries

Terms in the official ICD-10-CM index that lead to B82.9.

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 →
  • 129Intestinal parasitism, unspecifiedexact

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 B82.9

Is B82.9 billable?

Yes. B82.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can B82.9 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict B82.9 as a principal diagnosis.

Is B82.9 a CC or MCC?

No. B82.9 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does B82.9 group to?

B82.9 is used in the MS-DRG v44.0 logic for MS-DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC) and MS-DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders 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 B82.9?

The CMS General Equivalence Mappings map B82.9 to ICD-9-CM 129.