Homocysteine Test Cost and Medicare Coverage (CPT 83090)

Also called: plasma homocysteine · homocysteine level · Hcy — all the same test, CPT 83090.

Regional policy — rules vary by state — examples on this page are from one region what's this?

This test is governed by Local Coverage Determinations (LCDs) — rules written by regional Medicare contractors, each binding only in its own territory. Every region keeps its own covered-diagnosis list, so the examples on this page (drawn from one region’s policy) may differ in your state. Want your state’s actual answer? Send us your codes — the free lookup checks the policy that applies to you.

Does Medicare cover it?: Only for certain diagnoses — such as confirming a suspected B12 or folate deficiency when first results are borderline, the rare inherited disorder homocystinuria (examples only; details below)
You pay if covered: $0 — no deductible, no coinsurance
Medicare pays the lab: $17.92
Information verified: 2026-09-04

Buy it yourself — what you'd really pay

Where	Test price	Fee	Total
Ulta Lab Tests ultalabtests.com Partner link — we earn a commission if you order. No extra cost to you.	$36.95	$12.95 draw fee — one per order, covers every test on it	$49.90
Jason Health jasonhealth.com	$45	$18 one fee per order — covers every test on it	$63
Quest questhealth.com	$75	$6 physician service fee	$81
Labcorp ondemand.labcorp.com	$79	—	$79

Disclosure: the Ulta Lab Tests link above is a partner link. If you order through it, ClaraCover earns a commission. It costs you nothing extra, and it never changes what we tell you about Medicare coverage.

The short answer

Rarely — and almost never for the reason it’s usually ordered. Homocysteine has a popular reputation as a heart-health marker, and that’s precisely the use Medicare’s regional policies don’t pay for: homocysteine as cardiovascular risk screening, or inside a wellness panel, is treated as screening and denied. The covered uses are narrow and specific — mainly settling a genuinely ambiguous B12 or folate deficiency question. That mismatch between how it’s marketed and how it’s covered makes this one of the most predictable signature-pad tests in the book.

When Medicare DOES cover it

The covered picture (from one regional policy, LCD L34914) is short:

Confirming a suspected B12 or folate deficiency when the direct tests came back borderline — homocysteine rises in both deficiencies, so it works as the tiebreaker
Homocystinuria — a rare inherited metabolic disorder, and its monitoring
The same policy’s general rules apply: a specific suspicion, documented findings, no panels

When Medicare does NOT cover it

Heart-risk screening — the common one. Elevated homocysteine’s link to cardiovascular risk hasn’t translated into a covered screening use; ordered that way, expect a denial.
Wellness and longevity panels that bundle homocysteine — vitamin and micronutrient panels are treated as screening, categorically.
Routine re-testing once a deficiency question is settled.

If your test gets flagged, ask your doctor what question the test is answering — if it’s genuinely arbitrating a borderline B12/folate result, that reason belongs on the order. (Never ask anyone to change a code just to get coverage — that’s fraud. But doctors often have a legitimate reason for the test that simply wasn’t coded.)

What you pay if it IS covered: $0

Covered lab tests cost Medicare patients nothing — no deductible, no 20% coinsurance. Medicare pays the lab $17.92, and you owe zero.

What you pay if it is NOT covered — read this before you sign

Because the covered lane is so narrow, the Advance Beneficiary Notice (ABN) — the signature pad — shows up with this test more than almost any other. Before you sign:

Ask the lab to print exactly what you would owe. You’re entitled to the number in black and white. For perspective: when Medicare covers this exact test, it pays the lab $17.92.
Know the direct prices: $45 at Jason Health (jasonhealth.com — add their flat $18 lab-collection fee per order), $75 at Quest’s consumer site (questhealth.com, plus a $6 physician fee), and $79 at Labcorp OnDemand. If you want this number for your own knowledge, buying it directly beats signing a pad at an unknown price.

Before you sign the pad — 60-second checklist

Ask: “Can you print what I’ll owe if Medicare doesn’t pay?”
Ask your doctor: “What question is this test answering — and is it on the covered list?”
Compare the printed price to the direct-purchase prices before deciding how to proceed.

Quick questions people ask

What is homocysteine? An amino acid your body produces as a normal metabolic byproduct. B vitamins (B12, folate, B6) recycle it; when those run short — or in the rare disorder homocystinuria — the level climbs. That’s why the blood test is genuinely useful for vitamin-deficiency questions, and why high results usually point back to B vitamins rather than to a disease of their own.

What does a high homocysteine mean in a blood test? Most often: a possible B12 or folate shortage worth confirming, and your doctor will usually check those directly. High levels are also statistically associated with cardiovascular risk, but studies haven’t shown that lowering homocysteine prevents heart attacks — which is exactly why Medicare doesn’t pay for it as a heart test. Talk results through with your doctor.

Do you have to fast for a homocysteine test? Ask — practices vary. Some labs prefer fasting for this one, so follow the instructions on your order.

Sources and data dates

Medicare payment amount: CMS Clinical Laboratory Fee Schedule, 2026 Q3 file (national rate). Coverage rules: CMS Medicare Coverage Database, LCD L34914 and billing article A56416 (a regional policy used here as the example — your region’s policy may differ in details). Consumer prices checked September 2026. Information current as of the date shown above; coverage is always determined by Medicare when your claim is processed.

ClaraCover provides information, not medical, billing, or insurance advice. Talk to your doctor about what tests you need.