ICD-10-CM 2027 diagnosis code

B45Cryptococcosis

Not billable — use a more specific code

B45 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About B45

B45 is the ICD-10-CM diagnosis code for cryptococcosis. It belongs to block B35-B49 (mycoses) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: B45.0 (cryptococcosis), B45.1 (cryptococcosis), B45.2 (cryptococcosis), B45.3 (cryptococcosis), B45.7 (cryptococcosis), B45.8 (cryptococcosis) and B45.9 (unspecified).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under B45

Notes that apply from higher levels

Instructions written at a parent level also apply to B45.

Broader instructions also apply from B35-B49 Mycoses and Chapter 1: Certain infectious and parasitic diseases.

Code history

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2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about B45

Is B45 billable?: No. B45 is a header code. Report one of its more specific subcodes instead.