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ICD-10-CM B65.1: Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]

B65.1 is the billable ICD-10-CM code for schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis], in category B65 (Schistosomiasis [bilharziasis]) of the Helminthiases section. As a principal diagnosis it groups to MS-DRG 441 Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with MCC, MS-DRG 442 Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with CC, MS-DRG 443 Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis without CC/MCC (MDC 07 MDC 07: Diseases and Disorders of the Hepatobiliary System and Pancreas). As a secondary diagnosis it is a CC, excluded with 6 principal diagnoses. 4 LCD billing and coding articles list it as covered.

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: ICD-10-CM code descriptions: FY2027 (effective October 1, 2026); IPPS Table 5 (MS-DRG weights): v44 FY2027 (final rule + CN3) (effective October 1, 2026); ICD-10-CM to HCC mapping: PY2027 initial ICD-10-CM mappings (dates of service 2026) (payment year 2027); Medicare Coverage Database billing and coding articles: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: FY2028 code files, effective October 1, 2027 for the ICD-10-CM code descriptions; FY2028 final rule (August 2027), effective October 1, 2027; an April 1 interim grouper update when CMS issues one for the IPPS Table 5 (MS-DRG weights); PY2028 advance notice (February 2027) and the PY2027 midyear final mapping (spring 2027) for the ICD-10-CM to HCC mapping; weekly, every Thursday for the Medicare Coverage Database billing and coding articles.

Code
B65.1
billable FY2027 ICD-10-CM code
Category
B65 Schistosomiasis [bilharziasis]
Chapter
1: Certain infectious and parasitic diseases (A00-B99)
CC/MCC (MS-DRG v44)
CC
CMS-HCC V28
Not mapped
POA reporting
Required

Tabular list notes for B65.1

The tabular list has no notes on B65.1 itself; the notes below apply from its parent headings.

Inherited from B65 (Schistosomiasis [bilharziasis])

Includes
  • snail fever

MS-DRG grouping when B65.1 is the principal diagnosis

MS-DRG v44 groups for B65.1 as principal diagnosis
MDCMS-DRGs
07 MDC 07: Diseases and Disorders of the Hepatobiliary System and Pancreas441442443

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for B65.1 shows the full grouping logic.

CC/MCC status and inpatient edits

As a secondary diagnosis, B65.1 is a CC under MS-DRG v44, unless the principal diagnosis is one of the 6 codes in its exclusion list. Check B65.1 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.

CMS-HCC V28 risk adjustment

B65.1 does not map to a payment HCC in the PY2027 CMS-HCC V28 model, so on its own it does not change a Medicare Advantage risk score.

LCD billing and coding articles that list B65.1

4 current Medicare billing and coding articles list B65.1 among the diagnoses that support medical necessity for the services they cover.

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Frequently asked questions

What does ICD-10-CM B65.1 mean?

B65.1 means schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]. It is one of 6 billable codes under B65, schistosomiasis [bilharziasis].

Which MS-DRG does B65.1 group to?

As the principal diagnosis, B65.1 groups to MS-DRG 441 Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with MCC, MS-DRG 442 Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with CC, MS-DRG 443 Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis without CC/MCC (MDC 07 MDC 07: Diseases and Disorders of the Hepatobiliary System and Pancreas) under MS-DRG v44, before procedures and secondary diagnoses are applied.

Is B65.1 a CC or MCC?

B65.1 is a CC under MS-DRG v44; 6 principal diagnoses exclude it.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Disclaimer

The descriptor and notes are reproduced from the FY2027 ICD-10-CM files; MS-DRG, CC/MCC and HCC facts come from the CMS FY2027 and PY2027 tables. Code from the medical record and the ICD-10-CM Official Guidelines. Not legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.