Wiki Gonorrhea/Chlamydia Coding

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Code: Z11.3
Encounter for screening for infections with a predominantly sexual mode of transmission
Excludes 2: encounter for screening for human immunodeficiency virus [HIV] (Z11.4)
encounter for screening for human papillomavirus (Z11.51)
Parent Code Notes: Z11
Excludes1: encounter for diagnostic examination-code to sign or symptom

Category Notes
Persons encountering health services for examinations (Z00-Z13)
Note: Nonspecific abnormal findings disclosed at the time of these examinations are classified to categories R70-R94.
Excludes 1: examinations related to pregnancy and reproduction (Z30-Z36, Z39.-)

Coding Guidelines
Factors influencing health status and contact with health services (Z00-Z99)
Note: Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
(a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
(b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.
Wausau, WI
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According to ICD-10 mapping, both gonorrhea and chlamydia screening should be coded to Z11.3. However, in the ICD-10 book, chlamydia is assigned to code Z11.8, and gonorrhea is not specified. Can anyone help me determine which codes are correct? Thanks in advance!


True Blue
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You really shouldn't be coding from the GEMS (although in this case GEMS are correct)

Index is key.

Screening (for) > gonorrhea = Z11.3
Screening (for)> chlamydial Diseases = Z11.8 - Encounter for screening for other infectious and parasitic diseases\

Why? I have no idea
Last edited:
Wausau, WI
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Thank you! Although, in this case the GEMS are not correct since nothing regarding the code Z11.8 are mentioned.
So my understanding is that the ICD-10 book always supersedes what a document published by AAPC or CMS says.