CPT (Current Procedural Terminology) codes are five-digit numbers that describe every medical service or procedure. Your doctor, hospital, and insurance company use them to communicate exactly what was done. Every line on your medical bill has a CPT code, and knowing the code lets you look up what Medicare pays for that same service.

Why do providers charge so much more than Medicare pays?

Providers set their own "chargemaster" prices, which are essentially list prices. Medicare pays a fixed rate based on the resources each service actually requires (the RVU system for procedures, or the Clinical Lab Fee Schedule for lab tests). Commercial insurers typically pay 150% to 250% of Medicare rates. Uninsured patients are often billed the full chargemaster price, which can be 2x to 30x what Medicare pays.

Can I use Medicare rates to negotiate my bill?

Yes. Medicare rates are the closest thing to a "fair price" benchmark in U.S. healthcare. When negotiating, ask the provider what they accept from Medicare for the same CPT code. Most providers will accept 150% to 200% of Medicare for cash-pay patients, which is still far less than their chargemaster price. Many hospital financial assistance policies also use a multiple of Medicare as their discount floor.

How are Medicare rates calculated?

For most procedures, Medicare uses the Resource-Based Relative Value Scale (RBRVS). Each CPT code gets three RVU components: Work (physician time and skill), Practice Expense (overhead), and Malpractice. These are multiplied by geographic adjustment factors (GPCIs) and a conversion factor ($33.4009 in 2026). Lab tests (80000-89999 range) use a separate Clinical Laboratory Fee Schedule with flat national rates.

CPT 83970

Parathyroid Hormone (PTH) Level

CPT 83970 measures parathyroid hormone in your blood, a key regulator of calcium and phosphorus balance. Medicare pays approximately $30 to $40 for this test under the Clinical Laboratory Fee Schedule, but providers charge an average of $179.00. Direct-to-consumer labs offer PTH testing for $40 to $70, making the provider markup especially steep for this single analyte test.

Updated May 2026Source: CMS Clinical Lab Fee Schedule

CPT 83970 at a Glance

Medicare CLFS rate: ~$30 to $40
Average provider charge: $179.00
Markup: ~5x over Medicare rate
Direct-to-consumer price: $40 to $70

Test type: Single analyte (hormone)
Beneficiaries (2023): 1.12 million
Fee schedule: Clinical Laboratory (CLFS)
Rate type: National (no geographic adjustment)

How Lab Pricing Works (Clinical Laboratory Fee Schedule)

Unlike physician services that use RVUs and geographic adjustments, lab tests are priced under the Medicare Clinical Laboratory Fee Schedule (CLFS). The CLFS sets a single national rate for each lab test. There are no RVU components and no geographic cost adjustments. The same PTH test costs Medicare the same amount whether it is performed in New York City or rural Kansas.

Metric	Value
Medicare CLFS Rate	~$30 to $40
Average Provider Charge	$179.00
Markup Ratio	~5x
Pricing Method	National rate (CLFS), no geographic variation

Why PTH is one of the more expensive single lab tests: At $179 average charge, PTH is significantly more expensive than common tests like a metabolic panel ($60) or CBC ($30). This is because PTH requires immunoassay technology rather than simple chemistry analysis. However, the actual cost to run a PTH on modern automated immunoassay platforms is only $5 to $15 in reagents, making the $179 charge still heavily marked up.

Lab tests are priced under the Clinical Laboratory Fee Schedule, not the Physician Fee Schedule. Medicare lab rates are set nationally and do not vary by geographic location.

What Does a PTH Test Measure?

Parathyroid hormone (PTH) is produced by four small glands behind your thyroid. It regulates calcium and phosphorus levels in your blood by controlling how much calcium your bones release, how much calcium your kidneys reabsorb, and how much calcium your intestines absorb (via vitamin D activation).

When PTH Is Ordered

Calcium is abnormally high (hypercalcemia)
Calcium is abnormally low (hypocalcemia)
Monitoring chronic kidney disease
Evaluating osteoporosis causes
Post-thyroid or parathyroid surgery
Monitoring dialysis patients

The "Bone/Calcium Workup" Bundle

PTH (83970): $179 average charge
Vitamin D, 25-OH (82306): $177 average charge
Phosphorus (84100): ~$30 average charge
Calcium (already in CMP): $60 for panel
Total workup: $400+ at provider charges

PTH is usually interpreted alongside calcium results. High PTH with high calcium suggests primary hyperparathyroidism. High PTH with low calcium suggests secondary hyperparathyroidism (often from kidney disease or vitamin D deficiency). If your calcium on routine labs is consistently normal, recurring PTH testing may not be necessary.

Where to Get a PTH Test for Less

PTH is one of the lab tests where the savings from shopping around are most significant. The difference between a hospital lab and a direct-to-consumer option can be over $100 for the same test.

Direct-to-Consumer Labs: $40 to $70

Services like Ulta Lab Tests, Walk-In Lab, and Jason Health offer PTH testing for $40 to $70 without a doctor's order in most states. You pay online, visit a nearby Quest or LabCorp location for the blood draw, and receive results electronically. This represents savings of $100 or more compared to hospital pricing.

Independent Labs (with doctor's order): $50 to $90

If your doctor orders a PTH test, ask for the order to go to an independent lab (Quest or LabCorp) rather than a hospital lab. Independent labs typically charge 50% to 70% less than hospital outpatient labs for immunoassay tests like PTH.

Hospital Outpatient Labs: $150 to $250+

Hospital labs charge the highest rates for PTH testing, often $150 to $250 or more. If your endocrinologist or nephrologist is part of a hospital system, lab orders may automatically route to the hospital lab. Ask if you can use an independent lab for your blood draw instead.

For dialysis patients: PTH is monitored regularly for patients on dialysis and should be covered by Medicare or your insurer. However, the frequency of testing varies by CKD stage. If you are being billed for PTH tests more often than your clinical guidelines suggest, ask your nephrologist about the appropriate monitoring schedule.

What Insured Patients Actually Pay for a PTH Test

Insurance companies negotiate lab rates well below the $179 average charge. What you owe depends on your plan type and deductible status:

Your Situation	What You Likely Pay	How It Works
Copay plan (deductible met or N/A)	$0 to $15	Many plans cover lab work at 100% after deductible
Coinsurance plan (deductible met)	$6 to $15	20% of negotiated rate ($30 to $75)
High-deductible plan (deductible NOT met)	$30 to $75	Full negotiated rate applied to your deductible
Medicare Part B	$0	Medicare covers clinical lab tests at 100% (no coinsurance)

Common Billing Problems with CPT 83970

The expensive "bone/calcium workup" surprise

PTH is rarely ordered alone. It is often ordered alongside vitamin D (82306, $177 average), phosphorus (84100, ~$30), and sometimes ionized calcium (82330, ~$40). Together, this creates a "bone/calcium workup" that can total $400 or more at provider charges. If you have a high-deductible plan, ask your doctor which tests are truly necessary and whether you can get them at an independent lab where the combined cost may be $100 to $150 instead.

Unnecessary repeat testing when calcium is normal

If your calcium levels are consistently normal on routine metabolic panels, there may be no clinical reason to keep ordering PTH. Some providers include PTH in standing lab orders out of habit or protocol rather than clinical need. If you see PTH on your lab orders and your calcium has been consistently normal, ask whether the test is still necessary.

Intact PTH vs. total PTH confusion

CPT 83970 covers "intact" PTH, which is the standard test. Some labs may also offer "total PTH" or PTH fragments. Make sure you are not being charged for multiple PTH-related codes when only one test was clinically needed. The intact PTH (83970) is the standard of care for most clinical scenarios.

Frequently Asked Questions

How much does a PTH blood test cost without insurance?

Without insurance, a PTH test (CPT 83970) costs $100 to $250 at most hospitals and clinics, with the national average charge at $179. Direct-to-consumer labs like Ulta Lab Tests, Walk-In Lab, and Jason Health offer PTH testing for $40 to $70 without a doctor's order in most states. Medicare pays approximately $30 to $40 for this test.

Why did my doctor order a PTH test?

PTH is typically ordered when your calcium level is abnormal (either high or low on a metabolic panel), to evaluate bone disorders like osteoporosis, to monitor chronic kidney disease, or to check parathyroid gland function. It helps determine whether a calcium abnormality is caused by a parathyroid problem or another condition.

How often should PTH be tested for kidney disease patients?

For chronic kidney disease (CKD) patients, PTH monitoring frequency depends on disease stage. Stage 3 CKD patients are typically tested every 6 to 12 months. Stage 4 patients may be tested every 3 to 6 months. Dialysis patients may be tested every 3 to 6 months. Your nephrologist should determine the appropriate frequency. If you are being tested more often, ask whether the frequency is necessary.

Can I get a PTH test without a doctor ordering it?

Yes. In most states, direct-to-consumer lab services allow you to order a PTH test without a physician's order for $40 to $70. You pay online, visit a nearby lab location for the blood draw, and receive results electronically. A few states (New York, New Jersey, Rhode Island) have restrictions on direct-to-consumer lab ordering.

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