ICD-10-CM 2027
ICD-10 code for laboratory examination
Encounter for general adult medical examination without abnormal findings
From the official ICD-10-CM alphabetic index entry “Examination (for) (following) (general) (of) (routine) › laboratory (as part of a general medical examination)”. Page updated September 29, 2026.
About coding laboratory examination
The ICD-10-CM code for laboratory examination is Z00.00 (Encounter for general adult medical examination without abnormal findings). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Z00.00.
Within Z00.0, choose Z00.00 (without abnormal findings) only when documentation doesn't support a more specific option: with abnormal findings (Z00.01).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific laboratory examination codes (official index)
Common questions about laboratory examination ICD-10 codes
What is the ICD-10 code for laboratory examination?
- Z00.00 — Encounter for general adult medical examination without abnormal findings. More specific codes apply when the documentation supports them: Z00.01, Z01.812.
What is the ICD-10 code for preprocedural laboratory examination?
- Z01.812 — Encounter for preprocedural laboratory examination.
Is Z00.00 billable?
- Yes. Z00.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z00.00 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z00.00 a CC or MCC?
- No. Z00.00 is neither a CC nor an MCC under MS-DRG v44.0.