TL;DR: Aetna, a CVS Health company, modified CPB 0945 governing Vitamin D assay coverage, with an effective date of January 5, 2026. Here's what billing teams need to know about CPT 82306, 82652, and 0038U before claims start hitting your denial queue.
This policy update touches one of the highest-volume lab tests your team probably bills. Vitamin D testing under the Aetna Vitamin D assay coverage policy (CPB 0945) covers three CPT codes — 82306, 82652, and 0038U — but only when specific medical necessity criteria are met. The key line in this policy: Aetna draws a hard line between medically necessary Vitamin D testing and routine preventive screening. That distinction is where most denials happen.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Aetna, a CVS Health company |
| Policy | Vitamin D Assay |
| Policy Code | CPB 0945 |
| Change Type | Modified |
| Effective Date | January 5, 2026 |
| Impact Level | High |
| Specialties Affected | Internal medicine, endocrinology, nephrology, oncology, infectious disease, rheumatology, gastroenterology, primary care |
| Key Action | Audit your Vitamin D test claims billed without a covered ICD-10 diagnosis code and update charge capture before submitting 2026 claims |
Aetna Vitamin D Assay Coverage Criteria and Medical Necessity Requirements 2026
CPB 0945 Aetna system covers Vitamin D testing under CPT 82306, 82652, and 0038U — but only when you can tie the test to a covered diagnosis. Medical necessity is the gating factor here, and Aetna's list of covered diagnoses is long but specific.
The three codes work differently clinically. CPT 82306 measures 25-hydroxy Vitamin D and is the standard test for assessing Vitamin D status. CPT 82652 measures 1,25-dihydroxy Vitamin D — the active hormone form — and is typically ordered in kidney disease or granulomatous conditions where the conversion step is clinically relevant. CPT 0038U is a proprietary lab test (PLA code) using LC-MS/MS on a serum microsample, marketed by specific labs. All three are covered when selection criteria are met.
The covered diagnosis list spans over 550 ICD-10-CM codes. That's not a typo. Covered conditions include tuberculosis (A15.0–A19.9), HIV disease (B20), sarcoidosis (D86.0–D86.7), malignant neoplasms of the colon (C18.0–C20), pancreas (C25.0–C25.9), breast (C50.011–C50.929), prostate (C61), endometrium (C54.1), and melanoma (C43.0–C43.9), among hundreds of others.
The real issue here is pairing the right code to the right test. Billing CPT 82652 when you mean CPT 82306 — or vice versa — creates a medical necessity mismatch that drives claim denial before Aetna even evaluates the diagnosis.
If your practice bills Vitamin D testing for patients with any of these covered conditions, your diagnosis code selection has to be airtight. A vague or unspecified code won't get you there.
Aetna Vitamin D Assay Exclusions and Non-Covered Indications
This is the part that matters most for primary care and preventive medicine billing teams.
Aetna explicitly considers serum 25-hydroxyvitamin D measurement experimental, investigational, or unproven when ordered for routine preventive screening. That means if a clinician orders a Vitamin D level as part of a wellness visit with no documented medical indication — no deficiency risk, no covered underlying condition — Aetna will not cover it.
This is where high-volume denials live. Annual wellness visits often generate Vitamin D orders as a reflex. If those orders go out without a supported diagnosis from the covered list, your 82306 claim will reject. Every time.
The distinction Aetna draws is between screening (not covered) and diagnostic testing tied to a documented condition or risk factor (covered). Your documentation needs to show the "why" — not just the order.
Coverage Indications at a Glance
| Indication | Status | Relevant CPT Codes | Notes |
|---|---|---|---|
| Tuberculosis (A15.0–A19.9) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| HIV disease / medications reducing Vitamin D (B20) | Covered | 82306, 82652, 0038U | Document medication-related risk |
| Histoplasmosis (B39.x) | Covered | 82306, 82652, 0038U | Granulomatous condition — 82652 often appropriate |
| Sarcoidosis (D86.x) | Covered | 82306, 82652, 0038U | 82652 clinically relevant for active sarcoid |
| Cryptococcosis (B45.x) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Malignant neoplasm of colon/rectum (C18.0–C20) | Covered | 82306, 82652, 0038U | Oncology context; document treatment phase |
| Malignant neoplasm of pancreas (C25.x) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Melanoma (C43.x) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Malignant neoplasm of breast (C50.011–C50.929) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Malignant neoplasm of endometrium (C54.1) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Malignant neoplasm of prostate (C61) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Cat-scratch disease (A28.1) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Leprosy (A30.x) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Schistosomiasis (B65.x) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Pneumocystosis (B59) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Listeriosis (A32.9) | Covered | 82306, 82652, 0038U | Diagnosis code required |
| Routine preventive screening — no covered diagnosis | Not Covered | 82306, 82652, 0038U | Experimental/investigational per Aetna |
Aetna Vitamin D Assay Billing Guidelines and Action Items 2026
The effective date is January 5, 2026. If your team hasn't reviewed Vitamin D claim patterns since then, you're likely already generating avoidable denials. Here's what to do.
| # | Action Item |
|---|---|
| 1 | Audit your 2026 Vitamin D claims now. Pull all CPT 82306, 82652, and 0038U claims submitted on or after January 5, 2026. Filter for Aetna payers. Check every claim for a supporting ICD-10-CM code from the covered list. Any claim with a vague or missing diagnosis is a denial risk. |
| 2 | Update your charge capture workflow to require a covered diagnosis. Make the ICD-10 field mandatory for Vitamin D orders in your EHR before the order goes to the lab. If your system allows free-text ordering without a diagnosis link, that's your leak. Fix it. |
| 3 | Train your ordering clinicians on the preventive screening exclusion. Physicians ordering Vitamin D as a routine wellness add-on need to know this test requires medical justification under Aetna's coverage policy. A one-page reference card with common covered diagnoses works better than a policy document. |
| 4 | Distinguish CPT 82306 from CPT 82652 at the point of order. CPT 82652 — the 1,25-dihydroxy form — has specific clinical indications, particularly in kidney disease and granulomatous conditions like sarcoidosis (D86.x) and histoplasmosis (B39.x). Billing 82652 without a diagnosis that clinically supports active vitamin D hormone dysregulation invites a medical necessity denial. Make sure your lab order set reflects the right test for the right condition. |
| 5 | Review prior authorization requirements for CPT 0038U. PLA code 0038U involves proprietary LC-MS/MS testing. Aetna's prior authorization requirements for PLA codes can differ from standard lab codes. Confirm whether your Aetna contract requires prior auth for 0038U before billing it. If you're not sure, call your Aetna provider relations contact before January billing runs close. |
| 6 | Build a denial tracking category specifically for CPT 82306 and 82652. Vitamin D denials often get lumped into a general lab denial bucket. That hides the pattern. Break them out by denial reason. If you're seeing "not medically necessary" on 82306 claims, it's almost always a diagnosis code issue — either missing or not on the covered list. |
| 7 | Consult your compliance officer if your practice uses standing Vitamin D orders. Standing orders for Vitamin D testing — common in some internal medicine and geriatric practices — are a high-risk area under this coverage policy. If those orders go out without patient-specific diagnosis documentation, you have a billing compliance problem, not just a denial problem. Loop in your compliance officer before the next order cycle. |
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Vitamin D Assay Under CPB 0945
Covered CPT Codes (When Selection Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| 82306 | CPT | Vitamin D; 25 hydroxy, includes fraction(s), if performed |
| 82652 | CPT | Vitamin D; 1, 25 dihydroxy, includes fraction(s), if performed |
| 0038U | CPT (PLA) | Vitamin D, 25 hydroxy D2 and D3, by LC-MS/MS, serum microsample, quantitative |
Key ICD-10-CM Diagnosis Codes
The full covered list runs to 550 codes. Below are the most clinically significant code ranges and individual codes for Vitamin D assay reimbursement under CPB 0945. Build your charge capture and order sets around these.
| Code / Range | Description |
|---|---|
| A15.0–A19.9 | Tuberculosis |
| A28.1 | Cat-scratch disease |
| A30.0–A30.9 | Leprosy |
| A32.9 | Listeriosis, unspecified |
| B20 | HIV disease (medications known to reduce Vitamin D) |
| B39.0–B39.9 | Histoplasmosis |
| B45.0–B45.9 | Cryptococcosis |
| B59 | Pneumocystosis |
| B65.0–B65.9 | Schistosomiasis |
| C18.0–C20 | Malignant neoplasm of colon, rectum, and rectosigmoid junction |
| C25.0–C25.9 | Malignant neoplasm of pancreas |
| C43.0–C43.9 | Melanoma |
| C50.011–C50.929 | Malignant neoplasm of breast |
| C54.1 | Malignant neoplasm of endometrium |
| C61 | Malignant neoplasm of prostate |
| D86.0–D86.7 | Sarcoidosis |
The full list of 550 covered ICD-10-CM codes is available in the CPB 0945 Aetna policy document. Review the complete list before assuming a diagnosis qualifies — the covered conditions are specific, and adjacent codes may not be included.
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