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Darkfield Microscope Exam for Spirochetes

Illinois 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.

How much does Darkfield Microscope Exam for Spirochetes cost?

$13.49

Typical negotiated rate. In Illinois, July 2026.

Insurers have agreed to pay about $13.49 for this service. The price depends on where it is billed: about $9.77 from a physician practice, and about $18.62 from a hospital or other facility. The two figures are alternatives, not parts of one bill.

These are rates insurers have negotiated with providers, not the amount a patient is billed. What you owe depends on your plan's deductible and coinsurance. Based on rates published by 6 insurance carriers under federal price transparency rules.

Where it's billed changes the price

Billed byTypicalRange
Physician practiceA doctor's office, clinic or independent provider$9.77$8.71 to $16.22
FacilityA hospital or hospital-owned outpatient department$18.62$11.75 to $25.70

How much rates vary

Facilitymedian $19 · 10th to 90th $10 to $49Professionalmedian $10 · 10th to 90th $7 to $26
$5$10$20$50$100facility $19professional $10

Distribution of negotiated rates across all payers (price axis is log-scale). Each curve is scaled to its own total: facility and professional rates are different services, shown together to compare where they cluster. Need provider-level prices or 24+ months of history? Contact us.

Rates by insurance carrier

Insurance Carrier
Aetna
Setting
Facility
Modifier
Global
Typical Low
$9.33
Median
$17.78
Typical High
$30.90
Aetna
Setting
Professional
Modifier
Global
Typical Low
$8.71
Median
$9.77
Typical High
$23.99
BCBS
Setting
Facility
Modifier
Global
Typical Low
$14.79
Median
$30.20
Typical High
$117.49
BCBS
Setting
Professional
Modifier
Global
Typical Low
$3.47
Median
$7.41
Typical High
$8.71
Cigna
Setting
Facility
Modifier
Global
Typical Low
$12.59
Median
$26.30
Typical High
$52.48
Cigna
Setting
Professional
Modifier
Global
Typical Low
$6.03
Median
$13.49
Typical High
$20.42
Hally Health
Setting
Professional
Modifier
Global
Typical Low
$12.30
Median
$22.39
Typical High
$117.49
Hally Health
Setting
Facility
Modifier
Global
Typical Low
$100.00
Median
$100.00
Typical High
$100.00
Hally Health
Setting
Professional
Modifier
Global
Typical Low
$14.79
Median
$14.79
Typical High
$14.79
Molina
Setting
Professional
Modifier
Global
Typical Low
$6.17
Median
$6.17
Typical High
$6.17
United
Setting
Facility
Modifier
Global
Typical Low
$6.76
Median
$11.22
Typical High
$22.39
United
Setting
Professional
Modifier
Global
Typical Low
$4.79
Median
$7.24
Typical High
$11.22

Where Illinois sits

The same service costs 2.4 times more in Hawaii than in Washington, DC. Every bar is a state, most expensive first. Touch or drag across it to read any state, then open that state for its carriers and full range.

Illinois· 15th of 51

$13.49

HI $20.42DC $8.51

Median negotiated rate in each state, from every insurer that publishes one. States where no insurer publishes a rate for this service are not shown.