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Darkfield Microscope Exam for Spirochetes

Washington, DC rates for HCPCS 87166

Examination of fluid or scrapings under a microscope arranged so that light strikes the sample from the side, making extremely thin corkscrew-shaped bacteria stand out bright against a dark background. It is used mainly to look for the organism that causes syphilis in fluid taken from a sore, and it can give an answer straight away.

Rates data updated July 2026.

Facilitymedian $19 · 10th–90th $9$790%20%10th90th$19Professionalmedian $9 · 10th–90th $9$390%50%90th$9$5.0$10.0$20.0$50.0$100.0

Distribution of negotiated rates across all payers (price axis is log-scale). Facility and professional rates are different services and are charted separately. Need provider-level prices? Contact us.

Insurance Carrier
Aetna
Setting
Facility
Modifier
Global
Typical Low
$8.51
Median
$41.69
Typical High
$79.43
Aetna
Setting
Professional
Modifier
Global
Typical Low
$8.51
Median
$8.51
Typical High
$8.51
CareFirst
Setting
Professional
Modifier
Global
Typical Low
$32.36
Median
$57.54
Typical High
$125.89
Cigna
Setting
Facility
Modifier
Global
Typical Low
$18.20
Median
$19.05
Typical High
$43.65
Cigna
Setting
Professional
Modifier
Global
Typical Low
$6.17
Median
$13.18
Typical High
$89.13
Kaiser Permanente
Setting
Professional
Modifier
Global
Typical Low
$21.88
Median
$21.88
Typical High
$22.91
United
Setting
Facility
Modifier
Global
Typical Low
$6.61
Median
$13.49
Typical High
$13.49
United
Setting
Professional
Modifier
Global
Typical Low
$4.79
Median
$6.92
Typical High
$19.05