Ambulatory Blood Pressure Monitoring — NCD 254 | CMS Coverage Update

CMS modified NCD 254 for ambulatory blood pressure monitoring, effective February 14, 2026. Here's what your billing team needs to know.

The Centers for Medicare & Medicaid Services updated its ambulatory blood pressure monitoring coverage policy under NCD 254 in the Medicare system. This policy governs when ABPM is covered for Medicare beneficiaries — specifically for suspected white coat hypertension and suspected masked hypertension. The policy does not list specific CPT or HCPCS codes, which means your charge capture and claim submission depend on your MAC's billing guidelines and the Claims Processing Instructions in Transmittal 10073.

Quick-Reference Table

CMS Ambulatory Blood Pressure Monitoring Coverage Criteria and Medical Necessity Requirements 2026

The CMS ambulatory blood pressure monitoring coverage policy sets strict, measurable thresholds for medical necessity. This is not a policy where clinical judgment alone carries the claim. You need documented BP readings — specific numbers, from specific visits — before the service is billable to Medicare.

CMS covers ABPM once per year for Medicare beneficiaries. Coverage applies to two distinct clinical scenarios. Both require documented office BP readings from two separate visits, with at least two measurements per visit, plus at least two out-of-office measurements.

Suspected White Coat Hypertension is the first covered indication. The patient must show an average office systolic BP above 130 mm Hg but below 160 mm Hg, or diastolic BP above 80 mm Hg but below 100 mm Hg. Out-of-office readings must come in below 130/80 mm Hg. If the office readings hit 160/100 or higher, this indication doesn't apply — and billing ABPM under it is a claim denial waiting to happen.

Suspected Masked Hypertension is the second covered indication. Here, the patient's average office systolic BP sits between 120 mm Hg and 129 mm Hg, or diastolic between 75 mm Hg and 79 mm Hg — across two separate office visits. But their out-of-office readings are at or above 130/80 mm Hg. This is essentially the inverse of white coat hypertension: the office looks fine, but home readings are elevated.

Both indications require the same device and interpretation standards. The ABPM device must produce standardized 24-hour plots with daytime and nighttime windows clearly marked and normal BP bands shown. The treating physician or treating non-physician practitioner must interpret the results — not a different provider who reviewed the data later.

The device setup also has a documentation requirement that many billing teams miss. A test run in the physician's office is required before the patient leaves. And both oral and written instructions must be given to the patient. If your documentation doesn't reflect these steps, you have a medical necessity problem before the monitor even goes home with the patient.

The coverage policy does not mention prior authorization as a requirement. However, coverage for indications outside these two scenarios falls to your Medicare Administrative Contractor. That means MAC-level discretion — and MAC-level variation — applies to anything outside white coat or masked hypertension.

ABPM billing for Medicare hinges on specificity. The BP numbers in your documentation need to match the thresholds. Vague clinical notes don't cut it when an auditor pulls the chart.

CMS Ambulatory Blood Pressure Monitoring Exclusions and Non-Covered Indications

CMS does not list any nationally non-covered indications under NCD 254. The policy explicitly marks that section as "N/A."

That sounds clean. It's not. "N/A" for non-covered indications means other uses of ABPM aren't automatically covered — they're just not nationally decided either way. Those cases go to your local Medicare Administrative Contractor for a coverage determination. Your MAC may have a Local Coverage Determination (LCD) that addresses ABPM for other clinical uses. Check your MAC's LCD database before billing ABPM for anything beyond white coat or masked hypertension.

The once-per-year frequency limit is a hard boundary. A second ABPM claim in the same calendar year will deny, regardless of how well the clinical criteria are documented.

Coverage Indications at a Glance

CMS Ambulatory Blood Pressure Monitoring Billing Guidelines and Action Items 2026

This policy was modified with an effective date of February 14, 2026. If your team bills ABPM for Medicare patients, these steps apply now.

If your practice sees high volumes of ABPM — or if you're uncertain how your MAC interprets this policy for edge cases — loop in your compliance officer before your next billing cycle. The threshold criteria are specific enough that a pattern of non-compliant claims could draw a focused audit.

CPT, HCPCS, and ICD-10 Codes for Ambulatory Blood Pressure Monitoring Under NCD 254

A Note on Codes for This Policy

NCD 254 does not list specific CPT, HCPCS, or ICD-10 codes. This is uncommon for a national coverage determination and creates real ambiguity for ambulatory blood pressure monitoring billing.

CMS references Transmittal 10073 (Medicare Claims Processing) for billing instructions. That transmittal contains the codes your MAC uses to process ABPM claims. You need to pull Transmittal 10073 directly from CMS and confirm the applicable codes with your MAC before submitting claims.

Do not use codes pulled from clearinghouse lookups or older fee schedule references without confirming they're current. Reimbursement for ABPM depends on using the exact codes your MAC recognizes — and that can vary by contractor.

The absence of listed codes in NCD 254 is itself a billing risk. It means there's no single authoritative code list tied to this coverage policy. Your MAC is the ground truth here.