CPT 87164 Dark-Field Microscopy Reimbursement | OpenPayer

Summary & Overview

CPT 87164: Dark-Field Microscopic Exam of Direct Specimen

CPT code 87164 represents dark-field microscopic examination of a direct specimen collected by a laboratory analyst, used to visualize organisms or structures that are better seen against a dark background (for example, a smear from a penile lesion). This procedure is clinically important for detecting certain infectious agents and atypical structures that may be missed with standard light microscopy, making it a relevant diagnostic tool in outpatient and clinical laboratory settings nationwide. Key payers covered in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code and the clinical context in which it is used, an outline of typical sites of service, and an overview of common billing considerations. The publication presents national benchmarks where available, notes on documentation and coding context, and summarizes policy or reimbursement updates that affect laboratory billing practices. The content is geared to coders, laboratory managers, and health policy analysts seeking a clear, actionable summary of CPT code 87164 and its role in diagnostic laboratory services. Data not available in the input will be indicated where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare87164CPTdark-field microscopyclinical laboratoryspecimen collectionpathologydiagnostic testinglaboratory billing

Billing Code Overview

CPT code 87164 describes a laboratory procedure in which a lab analyst collects a direct specimen from any patient source and performs a microscopic examination on a dark background (dark-field microscopy) rather than traditional light microscopy. The description includes examples such as a smear from a penile lesion.

Service Type: Microscopic examination of direct specimens using dark-field microscopy
Typical Site of Service: Clinical laboratory or pathology laboratory, including outpatient lab settings where specimen collection and microscopy are performed

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A sexually active adult male presents to an outpatient sexual health clinic with a painful penile ulcer and reported recent unprotected intercourse. The clinician performs a focused genitourinary exam, documents lesion characteristics, and collects a direct specimen by preparing a smear from the lesion. The laboratory analyst receives the specimen, collects the required material, and performs a microscopic examination using dark-field microscopy to visualize Treponema pallidum or other spirochetes not readily seen on traditional bright-field microscopy. Results are reported to the ordering provider for confirmatory testing (serology or PCR) and subsequent public health reporting if a notifiable infection is identified.

Coding Specifications

Modifier	Description	When to Use
`11`	Professional component	When reporting the physician or qualified provider's interpretation of the test separate from the technical component.
`26`	Professional component	Used when only the professional component (interpretation) is being billed by the provider.

CPT 87168: Arthropod Identification, Macroscopic Examination

CPT-87172-PINWORM-ADHESIVE-TAPE-EXAMINATION

CPT 87172: Pinworm (Adhesive Tape) Microscopic Examination

CPT-87177-PARASITOLOGY-STOOL-CONCENTRATION-AND-OVA-EVALUATION

CPT 87177: Parasitology Stool Concentration and Ova Evaluation

CPT-87166-DARK-FIELD-MICROSCOPY-DIRECT-SPECIMEN

CPT 87166: Dark-Field Microscopic Exam of Direct Specimen

CPT-87176-TISSUE-HOMOGENIZATION-FOR-CULTURE-PREPARATION

CPT 87176: Tissue Homogenization for Culture Preparation

CPT-87169-PARASITOLOGY-MACROSCOPIC-EXAMINATION

CPT 87169: Parasitology Examination Without Microscope

Taxonomy Code	Specialty	Notes
`207RH0000X`	Infectious Disease Specialist	Often orders or interprets dark-field exams in complex or atypical infections.
`207L00000X`	Pathology	Laboratory pathologists oversee diagnostic microscopy and reporting.
`208000000X`	Family Medicine	Primary care clinicians frequently collect specimens and order testing for genital lesions.
`208D00000X`	Dermatology	Dermatologists evaluate and collect specimens from cutaneous or mucosal lesions.
`2086S0122X`	Urology	Urologists may perform specimen collection for penile lesions in specialty clinics.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`A51.9`	Early syphilis, unspecified	Dark-field microscopy is a classical diagnostic method for primary syphilis lesions.
`A53.9`	Other and unspecified tertiary syphilis (Note: tertiary stage atypical)	Although dark-field is primarily for early disease, syphilis staging codes are included for clinical context.
`A60.9`	Anogenital herpesviral infection, unspecified	Genital ulcerative disease differential; microscopy may help distinguish causes though PCR/antigen testing is preferred.
`L03.90`	Cellulitis, unspecified site	Secondary bacterial infection of a lesion may prompt culture and microscopic evaluation.
`R22.2`	Localized swelling, mass and lump, trunk (applied if lesion swelling documented)	Used when local swelling or mass associated with lesion is documented during evaluation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`87070`	Culture, bacterial; any source, aerobic, other than urine (culture growth, isolated organism, identification not included)	May be ordered alongside dark-field microscopy to detect bacterial pathogens from lesion swabs.
`87480`	Infectious agent detection by nucleic acid (DNA or RNA); Treponema pallidum, amplified probe technique	Often used as a molecular confirmatory test following a positive or equivocal dark-field exam.
`87164`	Laboratory collection and microscopic dark-field examination of a direct specimen (e.g., smear from a penile lesion)	Primary procedure described; used to visualize spirochetes in direct specimens.
`87210`	Smear, primary source with interpretation; Gram or Giemsa stain	May be performed on lesion smears for additional microscopic assessment of organisms and inflammatory cells.
`87340`	Immunoassay for treponemal antibody (e.g., treponemal test)	Serologic testing commonly performed in parallel or follow-up to microscopic findings.

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