CMS NCD 28 Update: What Billing Teams Need to Know About Drug Abuse Treatment Coverage in 2026
The Centers for Medicare & Medicaid Services has modified National Coverage Determination (NCD) 28, which governs Medicare coverage for drug abuse (chemical dependency) treatment—including inpatient detoxification, rehabilitation, and outpatient hospital services. This update, effective March 12, 2026, clarifies how A/B Medicare Administrative Contractors (MACs) should adjudicate medical necessity for substance use disorder treatment across care settings. If your practice or facility bills Medicare for drug abuse treatment services, understanding the scope and limitations of this NCD is critical to avoiding denials and ensuring compliant documentation.
| Field | Detail |
|---|---|
| Payer | CMS (Centers for Medicare & Medicaid Services) |
| Policy | Treatment of Drug Abuse (Chemical Dependency) |
| Policy Code | NCD 28 |
| Change Type | Modified |
| Effective Date | 2026-03-12 |
| Impact Level | Medium |
| Specialties Affected | Addiction medicine, behavioral health, hospital outpatient departments, inpatient hospital facilities |
| Key Action | Review documentation standards for medical necessity determinations and confirm MAC-specific guidance is reflected in your billing workflows. |
What CMS NCD 28 Covers: Drug Abuse Treatment Under Medicare
NCD 28 establishes Medicare's framework for covering drug substance abuse treatment across two primary settings: inpatient hospital care and outpatient hospital departments.
Inpatient coverage is available when it is medically necessary for a patient to receive detoxification and/or rehabilitation for drug substance abuse. This is not a blanket authorization—medical necessity must be established and documented for each patient, and the determination that inpatient-level care is required must be supported by accepted medical practice.
Outpatient hospital department coverage is available for patients who either have been discharged from an inpatient stay for drug substance abuse treatment or who require treatment but do not need the intensity and availability of services found only in the inpatient setting. These services are subject to the same coverage rules that apply to outpatient hospital services generally, as outlined in the Medicare Benefit Policy Manual (BPM), Chapter 6, §20.
The policy explicitly notes that services must be reasonable and necessary for the treatment of the individual's condition—citing BPM Chapter 16, §90 on general exclusions from coverage.
Medical Necessity Criteria for CMS Drug Abuse Treatment Coverage
This is where billing and documentation teams need to pay close attention. NCD 28 does not enumerate a rigid checklist for medical necessity. Instead, it delegates that determination to A/B MACs, instructing them to base decisions on accepted medical practice with input from their medical consultants.
What does that mean practically? Your documentation needs to support the clinical rationale for:
| # | Covered Indication |
|---|---|
| 1 | The specific substance(s) of abuse being treated |
| 2 | The duration of use and its impact on the patient's condition |
| 3 | The patient's medical and emotional condition at the time of treatment |
| 4 | The appropriate level of care—inpatient vs. outpatient—and why the chosen setting is medically justified |
CMS explicitly notes that the intensity and duration of drug abuse treatment may differ from alcohol treatment, depending on these variables. This distinction matters: a patient's clinical profile for opioid use disorder may justify a different treatment intensity than one presenting for alcohol detoxification. Your clinical documentation should reflect that specificity.
For facilities under Quality Improvement Organization (QIO) review, QIO determinations of medical necessity and appropriateness of level of care are binding on A/B MACs for claims adjudication purposes. If your facility is subject to QIO oversight, this adds a layer of external validation to your billing workflow that must be accounted for.
Inpatient vs. Outpatient: Coverage Distinctions That Affect Claims
One of the most billing-relevant elements of NCD 28 is the distinction between inpatient and outpatient coverage—and the conditions each requires.
Inpatient claims must demonstrate that the patient required the availability and intensity of services that only the inpatient hospital setting can provide. This is a higher bar, and documentation must directly address why outpatient treatment was insufficient for this patient's needs.
Outpatient claims are appropriate when the patient can be treated safely in a less intensive setting, or when they are transitioning out of an inpatient stay and continuing care. These claims fall under the standard outpatient hospital billing rules—meaning the usual incident-to rules, facility fee structures, and coverage conditions for outpatient hospital services all apply.
Neither setting has a predetermined length-of-stay or service duration built into NCD 28. Length and intensity of treatment are left to clinical judgment, MAC review, and—where applicable—QIO determination.
| 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 |
Affected Codes
This policy does not list specific CPT, HCPCS, or ICD-10 codes. NCD 28 establishes coverage principles and eligibility criteria without tying coverage to a defined code set.
This means your billing team must rely on the appropriate procedure and diagnosis codes for the specific services rendered, verified against your MAC's local coverage policies and billing guidelines. Consult your A/B MAC's website for any applicable Local Coverage Determinations (LCDs) or billing articles that may specify codes applicable to drug abuse treatment in your jurisdiction.
What Your Billing Team Should Do
| # | Action Item |
|---|---|
| 1 | Audit your documentation templates by March 12, 2026. Ensure that clinical notes for drug abuse treatment—both inpatient and outpatient—capture the four key variables CMS uses to determine medical necessity: substance type, duration of use, patient medical condition, and patient emotional condition. A template that works for alcohol detoxification may not be sufficient for opioid or polysubstance cases. |
| 2 | Identify your A/B MAC and review their current guidance. Because NCD 28 delegates medical necessity determinations to MACs, your specific MAC's published criteria—including any applicable LCDs—are the operative standard for your claims. Pull the current guidance from your MAC's website and confirm your internal policies align. |
| 3 | Determine whether your facility is subject to QIO review. If so, document the QIO determination process as part of your billing workflow. QIO findings are binding on MACs, so a favorable QIO determination is a strong defense against a denial—but only if it's properly documented and referenced on the claim. |
| 4 | Cross-reference BPM Chapter 6, §20 and Chapter 16, §90. These are the two cross-references explicitly cited in NCD 28. Your compliance team should confirm that your outpatient hospital service billing practices align with Chapter 6 §20, and that your documentation addresses the general exclusion provisions in Chapter 16 §90—particularly for services that could be characterized as not reasonable and necessary. |
| 5 | Train clinical documentation teams on the inpatient-vs.-outpatient distinction. Physicians and case managers documenting drug abuse treatment should understand that the threshold for inpatient justification is higher, and that documentation must explicitly address why outpatient services were insufficient—not simply that inpatient care was ordered. |
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