2027 ICD-10-CM Diagnosis Code B48.8Other specified mycoses
ICD-10-CM Codes›A00–B99›B35-B49›B48
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 6
- Not Chronic
B48.8 is a billable ICD-10-CM diagnosis code for other specified mycoses. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 791, 793, 867 through 869, 974 through 976. 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 7 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.
For Medicare Advantage risk adjustment, B48.8 maps to CMS-HCC Category 6 (Opportunistic Infections) under the V28 model, adding a risk factor of about 0.381 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
B48.8 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adiaspiromycosis
- Adiaspiromycosis caused by Blastomyces parvus
- Adiaspiromycosis caused by Emmonsia crescens
- Dactylariosis
- Deep mycosis
- Disseminated hyalohyphomycosis
- Disseminated infection caused by Chrysosporium
- Disseminated phaeohyphomycosis
- Fungal keratitis
- Fusarium infection
- Infection by Bipolaris hawaiiense
- Infection by Fusarium sporotrichiella
- Infection by Oomycetes
- Infection by Oomycota
- Infection by Paecilomyces variotii
- Infection by Pythium
- Infection by Scedosporium boydii
- Infection caused by Chrysosporium
- Infection caused by Magnusiomyces capitatus
- Infection caused by Pseudallescheria
- Infection caused by Rhodotorula
- Infection caused by Saprochaete
- Infection caused by Scytalidium
- Infection of brain caused by Form Dematiaceae
- Mycetoma caused by Fusarium
- Mycotic keratitis caused by Fusarium
- Mycotic keratitis caused by Fusarium oxysporum
- Mycotic keratitis caused by Fusarium solani
- Neonatal sepsis caused by Malassezia
- Opportunistic infectious disease
- Opportunistic mycosis
- Otomycosis externa caused by Fusarium
- Paecilomycosis
- Phaeohyphomycosis
- Rhodotorula glutinis or Rhodotorula mucilaginosa
- Scedosporiosis
- Sepsis caused by fungus
- Trichosporonosis
- Verrucous mycosis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B48.8: its own notes plus those printed at block B35-B49 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.
- diseases generally recognized as communicable or transmissible
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Adiaspiromycosis
- Infection of tissue and organs by Alternaria
- Infection of tissue and organs by Drechslera
- Infection of tissue and organs by Fusarium
- Infection of tissue and organs by saprophytic fungi NEC
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Adiaspiromycosis B48.8
Hemisporosis B48.8
opportunistic B48.8
specified NEC B48.8
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 B48.8 to ICD-9-CMHistory
Code HistoryHistory
Questions About B48.8Overview
What is the ICD-10 code for other specified mycoses?
The ICD-10-CM code for other specified mycoses is B48.8 (sometimes written as B488). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B48.8 (Other mycoses, not elsewhere classified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified mycoses on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B48.8 group to?
When other specified mycoses is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 974, 976, 975, 867, 869, 868, with relative weights from 0.6784 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is B48.8 a CC or MCC?
CMS lists B48.8 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 7 closely related codes in its exclusion list.
What is the ICD-9 equivalent of B48.8?
Under the General Equivalence Mappings, other specified mycoses converts to ICD-9-CM 117.8 (dematiacious fungi inf) and 118 (opportunistic mycoses). The mapping is approximate, so confirm the match fits the documentation.
What HCC is B48.8?
B48.8 (other specified mycoses) maps to CMS-HCC Category 6 (Opportunistic Infections), commonly written as HCC 6, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 6 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 5.
Does B48.8 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, B48.8 adds a risk adjustment factor of about 0.381 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.381 to 0.833 depending on the payment segment). HCC 6 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 6 category page.
