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CPT 87210: Wet Mount Preparation for Microscopic Examination

CPT code 87210 denotes a wet mount preparation performed by a laboratory analyst or microbiologist to visualize organisms or cells from material placed on a slide. This basic microscopy technique is widely used across clinical settings for rapid, point-of-care or laboratory-based diagnostic assessment, making it a commonly billed code in ambulatory clinics, hospital laboratories, and public health settings.

Key payers in national benchmarking and coverage reviews include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for when 87210 is applied, typical sites of service, and which payers are included in comparative analyses. The publication outlines common billing modifiers associated with laboratory and professional services, discusses service-line placement, and highlights considerations for documentation supporting microscopy procedures.

The report serves clinicians, laboratory managers, and billing professionals seeking clarity on clinical scope, payer coverage patterns, and administrative details related to wet mount preparations. Data not available in the input is noted where applicable.

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Billing Code Overview

CPT code 87210 describes a wet mount preparation of a specimen, performed by a lab analyst or microbiologist. The procedure typically involves placing material collected on a swab or directly on a microscope slide, adding saline or another mounting medium, and examining the sample microscopically to identify organisms, cells, or other diagnostic features.

Service type: Laboratory diagnostic microscopy procedure

Typical site of service: Clinical laboratory or hospital laboratory; can also be performed in outpatient clinic settings where microscope-equipped specimen processing is available

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CPT 87210: Wet Mount Preparation for Microscopic Examination

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Billing Code Overview

Service type: Laboratory diagnostic microscopy procedure

Typical site of service: Clinical laboratory or hospital laboratory; can also be performed in outpatient clinic settings where microscope-equipped specimen processing is available

Clinical & Coding Specifications

Clinical Context

A patient presents to an outpatient clinic with vulvovaginal itching, abnormal vaginal discharge, and dysuria. The clinician collects a vaginal swab at the point of care and sends the specimen to the on-site laboratory. A clinical laboratory technologist or microbiologist performs a wet mount preparation (87210) by placing the specimen on a microscope slide with saline (and potassium hydroxide if indicated) to evaluate for motile trichomonads, clue cells, yeast, and presence of white blood cells. Results are documented in the laboratory report and communicated to the ordering provider for treatment planning. Typical site of service is an ambulatory clinic or hospital outpatient laboratory; specimen may be collected in the clinic exam room and processed in a nearby lab. Patient encounter includes history, specimen collection, slide preparation, microscopic examination, and result reporting.

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management service by the same physician on the day of a procedure	Use when an E/M visit is performed in addition to the wet mount and is documented as separate and significant.
`26`	Professional component	Use when billing for the physician/component interpretation separate from the technical work (if applicable in split-billing arrangements).
`59`	Distinct procedural service	Use when the wet mount is separate and distinct from another procedure performed on the same day.
`76`	Repeat procedure by same physician	Use when the wet mount is repeated by the same provider for the same patient on the same day.
`77`	Repeat procedure by another physician (not in provided list)	Not listed; omitted per input constraints.
`90`	Reference (outside) laboratory	Use when the specimen is sent to an outside reference laboratory for the wet mount and the billing reflects reference lab use.
`91`	Repeat clinical diagnostic laboratory test	Use when the wet mount is repeated on the same specimen or patient within a short timeframe for confirmation.
`59`	(duplicate entry avoided)	(See first `59` row.)
`52`	Reduced services	Use when the wet mount is partially reduced or not completed as originally intended.
`53`	Discontinued procedure	Use when the wet mount preparation was started but discontinued before completion.
`90`	(duplicate entry avoided)	(See first `90` row.)

Taxonomy Code	Specialty	Notes
`207R00000X`	Pathology & Laboratory Medicine	Clinical laboratory directors and microbiologists who perform and oversee wet mount preparations.
`208000000X`	Family Medicine	Primary care clinicians who collect specimens and may perform point-of-care wet mounts.
`207L00000X`	Clinical Laboratory Science/Medical Technology	Laboratory technologists who perform slide preparation and microscopy.
`208D00000X`	Obstetrics & Gynecology	OB/GYN clinicians who evaluate vaginal complaints and order wet mount microscopy.
`363A00000X`	Emergency Medicine	Emergency clinicians who collect and may order immediate wet mount evaluation in urgent presentations.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`N76.0`	Acute vaginitis	Common indication for performing a wet mount to evaluate for infectious causes.
`N76.1`	Subacute and chronic vaginitis	Used when symptoms are persistent; wet mount assists in assessment.
`N89.8`	Other specified noninflammatory disorders of vagina	Wet mount may be used to evaluate abnormal discharge not due to obvious inflammation.
`A59.9`	Trichomoniasis, unspecified	Wet mount can detect motile trichomonads though less sensitive than NAAT.
`B37.3`	Candidiasis of vulva and vagina	Wet mount with KOH may reveal budding yeast or pseudohyphae suggesting candidiasis.
`N76.9`	Inflammatory disease of vagina, unspecified	Broad code used when inflammation identified; wet mount helps identify etiology.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`87070`	Culture, bacterial; any other source except urine, with isolation and presumptive identification of isolates	May be ordered if wet mount suggests bacterial vaginosis or other bacterial infection requiring culture.
`87481`	Infectious agent detection by nucleic acid (DNA or RNA); Trichomonas vaginalis, amplified probe technique	Performed when more sensitive molecular testing for trichomonas is indicated after or instead of wet mount.
`87800`	Infectious agent antigen detection by immunoassay technique, qualitative; Trichomonas vaginalis	Alternative point-of-care test for trichomonas when wet mount sensitivity is inadequate.
`87205`	Smear, primary source with interpretation; performed by clinician, uncomplicated	Related microscopic evaluation codes for direct smears performed outside a full laboratory wet mount workflow.
`99000`	Handling and/or conveyance of specimen to a laboratory (when applicable)	Ancillary service code sometimes used for specimen handling logistics in outpatient settings.

CPT 87205: Gram or Giemsa Stain on Primary Source, Technical Interpretation

CPT-87206-FLUORESCENT-ACID-FAST-STAIN-MICROSCOPY

CPT 87206: Fluorescent/Acid-Fast Stain Microscopy for Microorganisms

CPT-87207-SLIDE-ANALYSIS-FOR-INCLUSION-BODIES-PRIMARY-SOURCE

CPT 87207: Slide Analysis for Inclusion Bodies, Primary Source

CPT-87209-OVA-AND-PARASITE-COMPLEX-SPECIAL-STAIN

CPT 87209: Complex Special Stain for Ova and Parasites

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management service by the same physician on the day of a procedure	Use when an E/M visit is performed in addition to the wet mount and is documented as separate and significant.
`26`	Professional component	Use when billing for the physician/component interpretation separate from the technical work (if applicable in split-billing arrangements).
`59`	Distinct procedural service	Use when the wet mount is separate and distinct from another procedure performed on the same day.
`76`	Repeat procedure by same physician	Use when the wet mount is repeated by the same provider for the same patient on the same day.
`77`	Repeat procedure by another physician (not in provided list)	Not listed; omitted per input constraints.
`90`	Reference (outside) laboratory	Use when the specimen is sent to an outside reference laboratory for the wet mount and the billing reflects reference lab use.
`91`	Repeat clinical diagnostic laboratory test	Use when the wet mount is repeated on the same specimen or patient within a short timeframe for confirmation.
`59`	(duplicate entry avoided)	(See first `59` row.)
`52`	Reduced services	Use when the wet mount is partially reduced or not completed as originally intended.
`53`	Discontinued procedure	Use when the wet mount preparation was started but discontinued before completion.
`90`	(duplicate entry avoided)	(See first `90` row.)

Taxonomy Code	Specialty	Notes
`207R00000X`	Pathology & Laboratory Medicine	Clinical laboratory directors and microbiologists who perform and oversee wet mount preparations.
`208000000X`	Family Medicine	Primary care clinicians who collect specimens and may perform point-of-care wet mounts.
`207L00000X`	Clinical Laboratory Science/Medical Technology	Laboratory technologists who perform slide preparation and microscopy.
`208D00000X`	Obstetrics & Gynecology	OB/GYN clinicians who evaluate vaginal complaints and order wet mount microscopy.
`363A00000X`	Emergency Medicine	Emergency clinicians who collect and may order immediate wet mount evaluation in urgent presentations.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`N76.0`	Acute vaginitis	Common indication for performing a wet mount to evaluate for infectious causes.
`N76.1`	Subacute and chronic vaginitis	Used when symptoms are persistent; wet mount assists in assessment.
`N89.8`	Other specified noninflammatory disorders of vagina	Wet mount may be used to evaluate abnormal discharge not due to obvious inflammation.
`A59.9`	Trichomoniasis, unspecified	Wet mount can detect motile trichomonads though less sensitive than NAAT.
`B37.3`	Candidiasis of vulva and vagina	Wet mount with KOH may reveal budding yeast or pseudohyphae suggesting candidiasis.
`N76.9`	Inflammatory disease of vagina, unspecified	Broad code used when inflammation identified; wet mount helps identify etiology.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`87070`	Culture, bacterial; any other source except urine, with isolation and presumptive identification of isolates	May be ordered if wet mount suggests bacterial vaginosis or other bacterial infection requiring culture.
`87481`	Infectious agent detection by nucleic acid (DNA or RNA); Trichomonas vaginalis, amplified probe technique	Performed when more sensitive molecular testing for trichomonas is indicated after or instead of wet mount.
`87800`	Infectious agent antigen detection by immunoassay technique, qualitative; Trichomonas vaginalis	Alternative point-of-care test for trichomonas when wet mount sensitivity is inadequate.
`87205`	Smear, primary source with interpretation; performed by clinician, uncomplicated	Related microscopic evaluation codes for direct smears performed outside a full laboratory wet mount workflow.
`99000`	Handling and/or conveyance of specimen to a laboratory (when applicable)	Ancillary service code sometimes used for specimen handling logistics in outpatient settings.

CPT 87205: Gram or Giemsa Stain on Primary Source, Technical Interpretation

CPT-87206-FLUORESCENT-ACID-FAST-STAIN-MICROSCOPY

CPT 87206: Fluorescent/Acid-Fast Stain Microscopy for Microorganisms

CPT-87207-SLIDE-ANALYSIS-FOR-INCLUSION-BODIES-PRIMARY-SOURCE

CPT 87207: Slide Analysis for Inclusion Bodies, Primary Source

CPT-87209-OVA-AND-PARASITE-COMPLEX-SPECIAL-STAIN

CPT 87209: Complex Special Stain for Ova and Parasites

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

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CPT 87210: Wet Mount Preparation for Microscopic Examination

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Billing Code Overview

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CPT 87210: Wet Mount Preparation for Microscopic Examination

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References