2026 ICD-10-CM Diagnosis Code B48.1Rhinosporidiosis

ICD-10-CM Codes›A00–B99›B35-B49›B48

ICD-10-CM B48.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B48.1 is a billable ICD-10-CM diagnosis code for rhinosporidiosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. Coders also document this condition as cutaneous rhinosporidiosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.

Code Identity

ICD-10-CM Code
B48.1
Billable Status
Yes — Valid for Submission
Code Describes
Rhinosporidiosis
Short Description
Rhinosporidiosis
Same as the full description in the CMS dataset.
Parent Code
B48
Other mycoses, not elsewhere classified

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB48Other mycoses, not elsewhere classified
This CodeB48.1Rhinosporidiosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cutaneous rhinosporidiosis
  • Disseminated rhinosporidiosis
  • Infection caused by Rhinosporidium
  • Polypoid cutaneous rhinosporidiosis
  • Rhinosporidial mucosal polyp
  • Rhinosporidial papilloma
  • Rhinosporidiosis
  • Ulcerated cutaneous rhinosporidiosis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Infection, infected, infective(opportunistic)
      • Rhinosporidium (seeberi)
    • Rhinosporidiosis

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF004
Fungal infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Rhinosporidiosis

    chronic, localized granulomatous infection of mucocutaneous tissues, especially the nose, and characterized by hyperplasia and the development of polyps. it is found in humans and other animals and is caused by the mesomycetozoean organism rhinosporidium seeberi.

Patient EducationClinical

Fungal Infections

If you have ever had athlete's foot or a yeast infection, you can blame a fungus. A fungus is a primitive organism. Mushrooms, mold and mildew are examples. Fungi live in air, in soil, on plants and in water. Some live in the human body. Only about half of all types of fungi are harmful.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert B48.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
117.0 Rhinosporidiosis
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B48.1Overview

Is B48.1 (Other mycoses, not elsewhere classified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report rhinosporidiosis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B48.1 group to?

When rhinosporidiosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B48.1?

Under the General Equivalence Mappings, rhinosporidiosis converts to ICD-9-CM 117.0 (rhinosporidiosis). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.