A64
Unspecified sexually transmitted disease
BillableComplete code, valid to report
A64 is a billable ICD-10-CM diagnosis code for unspecified sexually transmitted disease. It is part of the FY2027 code set, effective October 1, 2026. The Alphabetic Index lists it under 3 entries. Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 6 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (6 notes)
Inherited from A50–A64 Infections with a predominantly sexual mode of transmission
- human immunodeficiency virus [HIV] disease (B20)
Inherited from Chapter 1 Certain infectious and parasitic diseases
- 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)
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
Inherited from Chapter 1 Certain infectious and parasitic diseases
- diseases generally recognized as communicable or transmissible
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 3 entries