Is ICD-10-CM code A59 billable?

No, A59 (Trichomoniasis) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code A59 belong to?

A59 belongs to Chapter 1 of the ICD-10-CM tabular list: A00–B99 (Certain Infectious and Parasitic Diseases).

A59Not billable, use a more specific code below

Trichomoniasis

In Infections with a predominantly sexual mode of transmission (A50-A64), chapter 1: Certain Infectious and Parasitic Diseases

7 billable codes under A59: none are a CC or MCC; none map to an HCC.

Instructional notes

Excludes2: not included here, code separately if applicable

intestinal trichomoniasis (A07.8)

Also applies, from Infections with a predominantly sexual mode of transmission (A50-A64)

These notes sit on A50-A64 and apply to every code under it, including A59.

Excludes1: not coded here, use a different code

nonspecific and nongonococcal urethritis (N34.1)
Reiter's disease (M02.3-)

Excludes2: not included here, code separately if applicable

human immunodeficiency virus [HIV] disease (B20)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.

Human Immunodeficiency Virus (HIV) Infections (page 19)
Infectious agents as the cause of diseases classified to other chapters (page 22)
Infections resistant to antibiotics (page 22)
Sepsis, Severe Sepsis, and Septic Shock (page 23)
Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
Zika virus infections (page 28)
Coronavirus infections (page 28)

Read Section I.C.1 (page 19)

All codes under A59

A59 can't be used on a claim. Pick a billable code below; grey headings group them.

A59 MS-DRGs

As the principal diagnosis, the billable codes under A59 group to these 10 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

DRG 727 Inflammation of the Male Reproductive System with MCC (4 of 7 codes)
DRG 728 Inflammation of the Male Reproductive System without MCC (4 of 7 codes)
DRG 742 Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC (4 of 7 codes)
DRG 743 Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC (4 of 7 codes)
DRG 757 Infections, Female Reproductive System with MCC (4 of 7 codes)
DRG 758 Infections, Female Reproductive System with CC (4 of 7 codes)
DRG 759 Infections, Female Reproductive System without CC/MCC (4 of 7 codes)
DRG 867 Other Infectious and Parasitic Diseases Diagnoses with MCC (2 of 7 codes)
DRG 868 Other Infectious and Parasitic Diseases Diagnoses with CC (2 of 7 codes)
DRG 869 Other Infectious and Parasitic Diseases Diagnoses without CC/MCC (2 of 7 codes)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Trichomoniasis

Trichomoniasis is a sexually transmitted infection (STI) caused by a parasite. It spreads from person to person during sex. Many people do not have any symptoms. If you do get symptoms, they usually happen within 5 to 28 days after being infected.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.