Folic Acid Level (Serum Folate)
CPT 82746 measures folic acid (folate) levels in your blood. It is often ordered alongside vitamin B-12 (CPT 82607) when evaluating anemia. Medicare pays approximately $10 to $14 for this test, but providers charge an average of $82.85. Here is the non-obvious part: since the US began mandatory folic acid fortification of grain products in 1998, folate deficiency has become rare in the general American population. Many guidelines now recommend against routine folate testing unless there is a specific clinical reason, yet it continues to be ordered reflexively as part of "routine" anemia workups.
CPT 82746 at a Glance
- Medicare CLFS rate: ~$10 to $14
- Average provider charge: $82.85
- Markup: ~6x to 8x over Medicare rate
- Direct-to-consumer price: $20 to $40
- What it measures: Folic acid in blood
- Beneficiaries (2023): 1.9 million
- Fee schedule: Clinical Laboratory (CLFS)
- Rate type: National (no geographic adjustment)
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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. A folic acid test costs Medicare the same amount regardless of where the lab is located.
| Metric | Value |
|---|---|
| Medicare CLFS Rate | ~$10 to $14 |
| Average Provider Charge | $82.85 |
| Markup Ratio | ~6x to 8x |
| Pricing Method | National rate (CLFS), no geographic variation |
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 Folic Acid Test Measure?
Folic acid (vitamin B9) is essential for DNA synthesis and red blood cell production. A serum folate test measures the amount of folic acid circulating in your blood. Low folate can cause megaloblastic anemia (large, immature red blood cells) and, during pregnancy, neural tube defects in the developing fetus.
When Folate Testing Is Genuinely Needed
- Macrocytic anemia (large red blood cells on CBC) when B-12 is normal
- Malabsorption disorders (celiac disease, Crohn's, short bowel syndrome)
- Chronic alcoholism (alcohol impairs folate absorption)
- Patients on methotrexate or certain seizure medications
- Pregnancy planning in women with a history of neural tube defects
When Folate Testing Is Often Unnecessary
- Routine annual blood work (no specific indication)
- Ordered reflexively alongside B-12 "just in case"
- Patients eating a standard American diet (fortified foods)
- Anemia evaluation before checking the MCV (red blood cell size)
- Follow-up testing when initial folate was normal
The key context: before 1998, folate deficiency was a real concern. Since mandatory fortification, serum folate levels in the US population have more than doubled. True folate deficiency is now largely limited to specific populations: people with malabsorption disorders, chronic alcoholics, and individuals on certain medications. For the general population, routine folate testing rarely changes clinical management but adds $83 to the bill.
Where to Get a Folate Test for Less
If you do need a folate test, the price varies dramatically depending on where it is ordered. Here are your options from cheapest to most expensive:
Direct-to-Consumer Labs: $20 to $40
Services like Ulta Lab Tests, Walk-In Lab, and Jason Health offer folate testing at a fraction of hospital pricing. Some bundle folate with B-12 for $35 to $60. You order online, visit a local lab for the blood draw, and get results electronically.
Independent Labs (with doctor's order): $15 to $30
If your doctor orders a folate level, ask for the order to go to Quest or LabCorp rather than the hospital's in-house lab. Independent labs charge substantially less for the same automated immunoassay test.
Hospital Outpatient Labs: $60 to $130+
Hospital labs charge the highest rates for folate testing. At $83 average, this is one of the more expensive single-analyte lab tests. If your doctor is in a hospital system, the order may automatically route to the hospital lab. For a test that may not be clinically necessary, paying hospital prices makes the cost even harder to justify.
What Insured Patients Actually Pay for Folate Testing
Insurance companies negotiate lab rates close to Medicare CLFS rates. What you owe depends on your plan:
| Your Situation | What You Likely Pay | How It Works |
|---|---|---|
| Copay plan (deductible met or N/A) | $0 to $10 | Many plans cover lab work at 100% after deductible |
| Coinsurance plan (deductible met) | $2 to $7 | 20% of negotiated rate ($10 to $35) |
| High-deductible plan (deductible NOT met) | $10 to $50 | Full negotiated rate applied to deductible |
| Medicare Part B | $0 | Medicare covers clinical lab tests at 100% (no coinsurance) |
Common Billing Problems with CPT 82746
Folate ordered reflexively alongside B-12 without clinical indication
The most common billing issue with folate is that it was ordered at all. Many doctors order "B-12 and folate" as a pair out of habit when evaluating anemia. Since folate deficiency is now rare in the US due to food fortification, the folate test often does not change the diagnosis or treatment plan. At $83 per test, this reflexive ordering adds up. If your folate came back normal (as it usually does), it is worth questioning whether the test was necessary for your specific situation.
B-12 and folate pair generating two expensive charges
When ordered together, B-12 (CPT 82607, ~$55 to $80) and folate (CPT 82746, ~$83) generate two separate charges totaling $135 to $160 at provider rates. At direct-to-consumer labs, the B-12/folate pair costs $35 to $60 total. If both tests are genuinely needed, routing them to an independent lab saves substantial money. If only B-12 is needed, skipping the folate saves even more.
Repeat folate testing after a normal result
If your initial folate level was normal, repeat testing is rarely needed unless your clinical situation has changed (for example, new malabsorption symptoms or starting a medication that depletes folate). If you see a repeat folate charge on a subsequent visit, ask whether the retest was clinically indicated.
Related Lab Codes
| Code | Description | Medicare CLFS | Avg. Charge |
|---|---|---|---|
| 82746 | Folic Acid Level (Serum) | ~$10-14 | $82.85 |
| 82607 | Vitamin B-12 Level | ~$10-14 | ~$55-80 |
| 85025 | CBC with Differential (checks for macrocytic anemia) | ~$8-10 | ~$30 |
| 82728 | Ferritin Level (iron stores) | ~$10-14 | $76.78 |
Frequently Asked Questions
How much does a folic acid test cost without insurance?
Without insurance, a folic acid test (CPT 82746) costs $50 to $130 at hospitals and clinics, with the national average at $82.85. Direct-to-consumer labs offer the test for $20 to $40. Medicare pays approximately $10 to $14 under the Clinical Laboratory Fee Schedule.
Is routine folate testing necessary?
For most Americans, no. Since 1998, the US has required folic acid fortification of enriched grain products, which dramatically reduced folate deficiency in the general population. Many clinical guidelines recommend against routine folate testing unless there is a specific indication like macrocytic anemia (with normal B-12), malabsorption disorders, chronic alcoholism, or pregnancy planning with a history of neural tube defects. If folate was ordered as part of a routine panel, ask whether it was clinically necessary.
Why are B-12 and folate always ordered together?
Historically, B-12 and folate were ordered together because both deficiencies cause the same type of anemia (macrocytic/megaloblastic). However, since food fortification made folate deficiency rare, B-12 deficiency is far more common. Many experts argue that ordering folate alongside B-12 is a reflexive habit rather than a clinical necessity, adding $83 to the bill without changing management in most cases. B-12 alone is often sufficient for an initial anemia evaluation.
When is a folic acid test genuinely needed?
Folic acid testing is genuinely useful for: macrocytic anemia when B-12 levels are normal, malabsorption conditions (celiac disease, Crohn's disease, short bowel syndrome), chronic alcoholism (alcohol impairs folate absorption), patients on methotrexate or certain seizure medications that deplete folate, and pregnancy planning in women with a prior history of neural tube defects. Outside these scenarios, the test rarely changes clinical decisions.
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