2027 ICD-10-CM Diagnosis Code B65.1Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]
ICD-10-CM Codes›A00–B99›B65-B83›B65
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
B65.1 is a billable ICD-10-CM diagnosis code for schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 441 through 443. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 6 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Encephalitis caused by Schistosoma
- Encephalitis caused by Schistosoma mansoni
- Granuloma of brain caused by Schistosoma mansoni
- Hepatic schistosomiasis
- Infection of liver and spleen caused by Schistosoma mansoni
- Infection of spleen
- Intestinal schistosomiasis
- Myelitis caused by Schistosoma
- Myelitis caused by Schistosoma mansoni
- Parasitic infection causing myelitis
- Schistosoma mansoni infection
- Splenitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B65.1: its own notes plus those printed at B65 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- snail fever
- diseases generally recognized as communicable or transmissible
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name B65.1, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming B65.1: they are not reported together with it, unless the two conditions are unrelated.
Code First 11
These codes say to code first a condition named in the note, and B65.1 is one of the conditions named.
- G07 Intracranial and intraspinal abscess and granuloma in diseases classified elsewhereschistosomiasis granuloma of brain (B65.-) names B65.-, which includes this code
- M63 Disorders of muscle in diseases classified elsewhereschistosomiasis (B65.-) names B65.-, which includes this code
- D77 Other disorders of blood and blood-forming organs in diseases classified elsewhere
- I52 Other heart disorders in diseases classified elsewhere
- J17 Pneumonia in diseases classified elsewhere
- J99 Respiratory disorders in diseases classified elsewhere
- K67 Disorders of peritoneum in infectious diseases classified elsewhere
- K77 Liver disorders in diseases classified elsewhere
- N22 Calculus of urinary tract in diseases classified elsewhere
- N29 Other disorders of kidney and ureter in diseases classified elsewhere
- N33 Bladder disorders in diseases classified elsewhere
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) L02.91
bilharziasis B65.1
Bilharziasis See Also: Schistosomiasis;
intestinal B65.1
Disease, diseased See Also: Syndrome;
Manson's B65.1
Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical) A09
schistosomal B65.1
Egyptian splenomegaly B65.1
mansoni B65.1
disease B65.1
schistosomiasis B65.1
colon B65.1
S. mansoni B65.1
intestinal B65.1
Manson's (intestinal) B65.1
mansoni B65.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Parasitic Diseases
Parasites are living things that use other living things - like your body - for food and a place to live. You can get them from contaminated food or water, a bug bite, or sexual contact. Some parasitic diseases are easily treated and some are not.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B65.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B65.1Overview
Is B65.1 (Schistosomiasis [bilharziasis]) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis] on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B65.1 group to?
When schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis] is the principal diagnosis on an inpatient stay, it groups to MS-DRG 442, 441, 443, with relative weights from 0.6890 to 1.8226 depending on complications. Higher weights mean higher Medicare reimbursement.
Is B65.1 a CC or MCC?
CMS lists B65.1 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 6 closely related codes in its exclusion list.
What is the ICD-9 equivalent of B65.1?
Under the General Equivalence Mappings, schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis] converts to ICD-9-CM 120.1 (schistosoma mansoni). The mapping is a direct match.
