Lab tests CPT 86431 Inpatient — admitted to hospital

Rheumatoid factor test cost in Clearlake, CA — inpatient

In Clearlake, CA, 1 hospital lists a cash price for rheumatoid factor (RF) test as an inpatient: from $79.00 to $79.00, with a median of $79.00. Across California, the median is $13.20 at 185 hospitals.

Cash prices at 1 facility for code 86431, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Apr 1, 2026 and Apr 1, 2026.

Lowest$79.00Sutter Lakeside Hospital

Median$79.00half of hospitals charge less

Highest$79.00in this market

Difference1.0×highest vs lowest

Hospitals, cheapest first

Hospital	Cash price	List price	Insurers pay	Off list
Sutter Lakeside Hospital Lakeport, CA · (707) 262-5000 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file	$79.00	$79.00	—	—

Hospital The hospital that published the price, its city and the line exactly as written in its price file.

Cash price The hospital's own price for a patient paying without insurance (“discounted cash” in its price file). Hospitals must publish it under federal law, 45 CFR 180.50. Call to confirm it before booking. More

List price The hospital's full chargemaster price (“gross charge”) before any discount. Almost nobody pays it; the gap to the cash price shows what the self-pay discount is worth. More

Insurers pay The lowest and highest rates this hospital has agreed with insurance plans for the same item, from its price file. If the cash price is below what your plan pays and you have not met your deductible, paying cash can cost you less. More

Off list How much lower the cash price is than the list price.

No cash discount This line's cash price equals the hospital's full list price. Many hospitals still reduce bills for uninsured patients: ask the billing office for its self-pay discount in writing. More

Inpatient: lowest $79.00, median $79.00, highest $79.00.

As an outpatient, the same code is billed by 1 facility here, median $79.00 — that is the price to compare if you are not being admitted.

What it is

Rheumatoid factor is an antibody found in many people with rheumatoid arthritis. The test is part of the workup for joint pain and swelling.

What the price covers

The price usually covers running the test. The blood draw (36415) is often billed as a separate line.