Drugs of Abuse: Definitive Testing
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Coverage policy defining medical necessity, coding, and prior authorization protocols for definitive drugs-of-abuse testing (e.g., GC/MS, LC/MS) for Ambetter Nevada members/enrollees. Affects ordering providers, laboratories, and billing for definitive drug testing.
No material clinical or coverage changes in this revision.
Coverage Criteria
Medically necessary indications (summary)
Covered when policy‑specified medical necessity criteria are met.
Detailed numbered criteria (I/II/III) referenced in policy; see full policy for itemized conditions.
Presumptive drug testing criteria have been removed from this policy and are now addressed under CP.MP.208 (Drugs of Abuse: Presumptive Testing). This policy focuses on definitive testing and the medical necessity criteria that support coverage, including blanket orders, reflex definitive testing following point-of-care presumptive testing, physician standing orders, billing for individual drugs included in a panel, and laboratory-based presumptive immunoassay testing when point-of-care testing was performed. The policy revisions added and removed CPT entries over time and explicitly designated a set of CPT codes as not medically necessary; users should follow the coding tables in this policy and refer to CP.MP.208 for presumptive testing rules.
The policy identifies HCPCS codes G0482 and G0483 as codes that do not support the coverage criteria. In addition, specific CPT codes listed in the policy (including codes added as not medically necessary such as 0143U–0150U and later additions like 0328U) are designated as not supporting coverage decisions. Billing with these HCPCS or CPT codes may not meet medical necessity per the policy coding tables and should be avoided when seeking coverage for definitive testing.
Indications Covered
Definitive testing following an appropriate presumptive test or where definitive testing is clinically indicated
Definitive testing is covered when one or more of the following clinical circumstances are met:
Reflex testing covered when presumptive POC testing performed; physician standing orders may trigger reflex testing.
Policy recognizes blanket and standing physician orders as valid indications for definitive testing.
Definitive testing methods must meet laboratory standards described in the policy (see definitions and background).
Includes IA testing used to confirm results obtained by CLIA‑waived POC methods.
Coding
| unspecified HCPCS (definitive methods description) | HCPCS codes that support coverage criteria: definitive methods (GC/MS, LC/MS), excluding immunoassays; qualitative or quantitative; includes specimen validity testing, per day, any number of drug classes |
| G0482 | Drug test(s), definitive, utilizing drug identification methods able to identify individual drugs and distinguish between structural isomers; includes specimen validity testing, per day; 15 to 21 drug class(es), including metabolite(s) if performed. |
| G0483 | Drug test(s), definitive, utilizing drug identification methods able to identify individual drugs and distinguish between structural isomers; includes specimen validity testing, per day; 22 or more drug class(es), including metabolite(s) if performed. |
| 0143U | CPT code listed as not medically necessary (deleted later) |
| 0144U | CPT code listed as not medically necessary (deleted later) |
| 0145U | CPT code listed as not medically necessary (deleted later) |
| 0146U | CPT code listed as not medically necessary (deleted later) |
| 0147U | CPT code listed as not medically necessary (deleted later) |
| 0148U | CPT code listed as not medically necessary (deleted later) |
| 0149U | CPT code listed as not medically necessary (deleted later) |
| 0150U | CPT code listed as not medically necessary (deleted later) |
| 80367 | Added to coding tables supporting coverage criteria |
| 80368 | Added to coding tables supporting coverage criteria |
Provider Actions & Billing
Prior Authorization Required
Prior authorization is required for definitive drugs-of-abuse testing except where noted below. Testing for children under 6 years of age is exempt from prior authorization. Prior authorization requests will be accepted up to 10 business days after specimen collection and will be reviewed for medical necessity based on the policy criteria.
- PA not required for patients < 6 years of age
- PA requests accepted up to 10 business days after specimen collection
Coding Mismatches May Trigger Denial
Coding that does not match the policy-supported CPT/HCPCS codes (including codes listed as not supporting coverage) may lead to claim denial or non-coverage decisions. Verify that billed CPT/HCPCS codes align with the policy's covered code lists and medical necessity criteria before submission.
- Use only CPT/HCPCS codes that support coverage per the policy
- Codes listed as not supporting coverage (e.g., specific U-codes added/removed in revisions) may trigger denial
Prior Authorization Timing and Exemptions
Providers must submit prior authorization requests within the stated timing window unless the member is < 6 years of age (exempt). Requests received within 10 business days after specimen collection will be accepted and reviewed for medical necessity. Ensure documentation supports the medical necessity criteria at time of review.
- PA acceptance window: up to 10 business days after specimen collection
- Exemption: children < 6 years of age
Provider Submission Guidance
Follow payer instructions for submitting PA and clinical documentation. Incomplete or miscoded submissions increase the risk of denial or delay.
- Include clinical rationale that meets the policy's medical necessity criteria
- Confirm CPT/HCPCS codes align with policy-covered lists prior to submission
Ordering Requirements
Ordering: reflex definitive testing allowed after presumptive POC test
Reflex definitive testing is covered when performed after an appropriate presumptive test at the point of care; physician standing orders and blanket orders are recognized as valid ordering mechanisms.
- Definitive testing supported following appropriate presumptive POC testing
- Physician standing orders and blanket orders are acceptable for ordering reflex testing
Not Covered
Definitive testing billed using HCPCS G0482 or G0483, or with CPT codes the policy designates as not supporting coverage criteria, is identified as not covered. Claims submitted with these specific HCPCS/CPT codes do not meet the policy’s coding requirements for definitive drugs-of-abuse testing and may be denied for lack of medical necessity. Providers and laboratories must code tests in accordance with the policy’s coding tables to support coverage.
Definitions
Frequency Limits
Background
Definitive drug testing in this policy is defined to use analytical methods capable of identifying individual drugs and distinguishing structural isomers — for example, GC/MS or LC/MS (single or tandem) — with method- or drug-specific calibration, matrix-matched quality control, and the use of stable isotope or other universally recognized internal standards. The HCPCS descriptions for definitive testing (e.g., G0482/G0483) explicitly reference these requirements, and the policy treats immunoassay methods (IA, EIA, ELISA, EMIT, FPIA) as presumptive screening methods addressed in CP.MP.208.
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