2027 ICD-10-CM Diagnosis Code B45Cryptococcosis

ICD-10-CM Codes›A00–B99›B35-B49›B45

ICD-10-CM B45
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B45 is a non-billable ICD-10-CM category code for cryptococcosis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B45.0, B45.1, B45.2, and B45.3.

Code Identity

ICD-10-CM Code
B45
Billable Status
No — Non-Billable Category
Code Describes
Cryptococcosis
Short Description
Cryptococcosis
Same as the full description in the CMS dataset.
Chapter
B35-B49
Mycoses

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB45Cryptococcosis
This CodeB45Cryptococcosis

Specific Coding for CryptococcosisOverview

Non-specific codes like B45 require more characters. Use one of these billable codes instead:

  • Use B45.0 for Pulmonary cryptococcosis

  • Use B45.1 for Cerebral cryptococcosis

  • Use B45.2 for Cutaneous cryptococcosis

  • Use B45.3 for Osseous cryptococcosis

  • Use B45.7 for Disseminated cryptococcosis

  • Use B45.8 for Other forms of cryptococcosis

  • Use B45.9 for Cryptococcosis, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B45: 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.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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.

From Block B35-B49 Mycoses applies to 104 codes
  • hypersensitivity pneumonitis due to organic dust (J67.-)
  • mycosis fungoides (C84.0-)
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Clinical InformationClinical

  • Cryptococcosis

    fungal infection caused by genus cryptococcus.

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.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B45Overview

What is the ICD-10 code for cryptococcosis?

B45 is the ICD-10-CM category for cryptococcosis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is B45 (Cryptococcosis) a billable code?

No. This is a category header that groups the codes for cryptococcosis, and headers cannot be submitted on claims. Claims for cryptococcosis need a more specific code from this category, such as B45.0, B45.1, and B45.2.