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Blood Phosphorus (Phosphate) Test

Washington, DC rates for HCPCS 84100

Measures the amount of phosphate, a mineral the body uses for bone strength, energy production and cell function, in a blood sample. Levels drift when the kidneys are not clearing phosphate properly, when the parathyroid glands are over- or under-active, or when vitamin D is out of balance, so it is usually read alongside calcium. Measuring phosphate in a urine sample is a separate test.

Rates data updated July 2026.

How much does Blood Phosphorus (Phosphate) Test cost?

$27.54

Typical negotiated rate. In Washington, DC, July 2026.

Insurers have agreed to pay about $27.54 for this service. The price depends on where it is billed: about $3.55 from a physician practice, and about $33.11 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 5 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$3.55$3.55 to $3.55
FacilityA hospital or hospital-owned outpatient department$33.11$16.98 to $69.18

How much rates vary

Facilitymedian $33 · 10th to 90th $9 to $89Professionalmedian $4 · 10th to 90th $4 to $17
$2$10$50$200$1Kfacility $33professional $4

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
$8.71
Median
$33.11
Typical High
$89.13
Aetna
Setting
Professional
Modifier
Global
Typical Low
$3.55
Median
$3.55
Typical High
$3.55
CareFirst
Setting
Professional
Modifier
Global
Typical Low
$13.49
Median
$23.99
Typical High
$52.48
Cigna
Setting
Facility
Modifier
Global
Typical Low
$7.76
Median
$7.94
Typical High
$17.38
Cigna
Setting
Professional
Modifier
Global
Typical Low
$2.69
Median
$5.75
Typical High
$38.02
Kaiser Permanente
Setting
Professional
Modifier
Global
Typical Low
$9.12
Median
$9.12
Typical High
$9.55
United
Setting
Facility
Modifier
Global
Typical Low
$2.75
Median
$5.75
Typical High
$12.88
United
Setting
Professional
Modifier
Global
Typical Low
$2.00
Median
$2.82
Typical High
$8.13

Where Washington, DC sits

The same service costs 9.8 times more in West Virginia than in New Mexico. 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.

Washington, DC· 4th of 51

$27.54

WV $43.65NM $4.47

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.