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Thyroxine Binding Globulin Blood Test

Maryland rates for HCPCS 84442

A blood test that measures the level of thyroxine binding globulin, a protein made by the liver that carries thyroid hormone through the bloodstream. It helps doctors interpret thyroid hormone levels correctly, since changes in this carrier protein — from pregnancy, liver disease, certain medications, or inherited conditions — can make total thyroid hormone results look abnormal even when thyroid function itself is normal. A small blood sample is all that's needed.

Rates data updated July 2026.

How much does Thyroxine Binding Globulin Blood Test cost?

$11.75

Typical negotiated rate. In Maryland, July 2026.

Insurers have agreed to pay about $11.75 for this service. The price depends on where it is billed: about $10.96 from a physician practice, and about $39.81 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$10.96$10.96 to $18.20
FacilityA hospital or hospital-owned outpatient department$39.81$10.23 to $40.74

How much rates vary

Facilitymedian $40 · 10th to 90th $7 to $41Professionalmedian $11 · 10th to 90th $9 to $58
$10$20$50$100facility $40professional $11

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. Small sample; interpret with caution. Need provider-level prices or 24+ months of history? Contact us.

Rates by insurance carrier

Insurance Carrier
Aetna
Setting
Facility
Modifier
Global
Typical Low
$21.38
Median
$39.81
Typical High
$40.74
Aetna
Setting
Professional
Modifier
Global
Typical Low
$9.77
Median
$12.30
Typical High
$57.54
CareFirst
Setting
Professional
Modifier
Global
Typical Low
$4.47
Median
$11.75
Typical High
$14.45
Cigna
Setting
Facility
Modifier
Global
Typical Low
$7.76
Median
$10.23
Typical High
$19.05
Cigna
Setting
Professional
Modifier
Global
Typical Low
$8.13
Median
$14.79
Typical High
$36.31
Kaiser Permanente
Setting
Professional
Modifier
Global
Typical Low
$14.79
Median
$17.78
Typical High
$28.84
United
Setting
Facility
Modifier
Global
Typical Low
$6.17
Median
$9.55
Typical High
$51.29
United
Setting
Professional
Modifier
Global
Typical Low
$6.61
Median
$8.91
Typical High
$15.85
Wellpoint
Setting
Professional
Modifier
Global
Typical Low
$5.75
Median
$10.23
Typical High
$22.39

Where Maryland sits

The same service costs 2.6 times more in Nebraska 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.

Maryland· 49th of 51

$11.75

NE $28.18DC $10.96

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.