Ambulance Services
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Defines medical necessity, origin/destination rules, documentation, coding guidance, covered and excluded circumstances for ground and air ambulance transports affecting Presbyterian Health Plan members (commercial, Medicare, and Medicaid where noted).
No material clinical or coverage changes in this revision.
Coverage criteria for ambulance services
Air ambulance inter-facility transfer criteria
Air ambulance (hospital-to-hospital) is covered when ALL of the following requirements are met:
Appropriate Facility and medical reasonableness definitions support these requirements (see dispatch and appropriate facility criteria).
Ground ambulance origin/destination criteria
Ground ambulance transports are covered when ALL program requirements are met and origin/destination match allowed destinations:
Institutional criteria per Social Security Act sections apply; additional dispatch/protocol requirements described in definitions.
General coverage basis
Policy follows CMS National Coverage Policy and CFR guidance for ambulance coverage; no criteria changes in this publication.
References include CMS manuals, CFR Title 42, and related CMS guidance; publication history notes no criteria change.
Ambulance services (ground and air) are not covered when they are not medically necessary. Examples of non-covered circumstances include use of ambulance services as a convenience for the member or family, situations where the member refuses assessment, treatment, or transportation, and any non-emergent or scheduled air ambulance transports. Payment is also excluded when air transport is used even though ground transport poses no threat and the pickup point is accessible by land. When a member is pronounced dead before dispatch, ambulance services are not covered; limited base-rate payment rules apply if death occurs after dispatch and before loading. Non-emergency wheelchair transport and transport to obtain non-covered services are also excluded.
Per Title XVIII Section 1862(a)(1)(A) of the Social Security Act, payment will not be made for items or services that are not reasonable and necessary for the diagnosis or treatment of illness or injury. Ambulance services that fail to meet this standard are excluded from payment under this policy.
Non-emergency ambulance transportation is not covered if the service could have been safely and effectively provided at the point of origin (for example, the patient’s residence, SNF, or hospital), even when the patient could only have reached the service by ambulance. The policy reiterates that transport provided solely because the patient cannot otherwise travel does not, by itself, establish medical necessity. Additionally, non-emergency wheelchair-only transport is specifically excluded.
This policy follows federal guidance that coverage is limited to services that are reasonable and necessary under Title XVIII Section 1862(a)(1)(A). Services that are not reasonable and necessary for diagnosis or treatment — including ambulance services that do not meet clinical medical-necessity criteria — are considered not medically necessary and are not payable.
Coding and billing guidance
| A0430 | Air ambulance service, transport, one-way, fixed wing (FW) |
| A0431 | Air ambulance service, conventional air services, transport, one-way, rotary wing (RW) |
| A0435 | Fixed wing air mileage, per statute mile |
| A0436 | Rotary wing air mileage, per statute mile |
| A0428 | Ambulance service, basic life support, non-emergency transport (BLS) |
| A0425 | Ambulance ground mileage, per statute mile (BLS/ALS) |
| A0426 | Ambulance service, advanced life support, non-emergency transport, level 1 (ALS1) |
| A0427 | Ambulance service, advanced life support, emergency transport, level 1 (ALS1-emergency) |
| A0429 | Ambulance service, basic life support, emergency transport (BLS emergency) |
| A0433 | Advanced life support, level 2 (ALS2) |
| Z74.01 | Bed Confinement status (secondary diagnosis must be reported) |
| Z74.3 | Need for continuous supervision (use to denote cardiac/hemodynamic monitoring required en route) |
| Z78.1 | Physical restraint status (patient safety; danger to self/others) |
| Z99.89 | Dependence on other enabling machines and devices (e.g., continuous IV fluids, active airway management) |
| Z76.89 | Persons encountering health services in other specified circumstances (used when transported but did not require ambulance crew services) |
| A0430 | Ambulance service, advanced life support, non-emergency transport, level 1 (A0430 listed as not requiring PA) |
| A0431 | Ambulance service, advanced life support, emergency transport (A0431 listed as not requiring PA) |
| A0435 | Fixed wing air ambulance transport, (listed as not requiring PA) |
| A0436 | Rotary wing air ambulance transport, (listed as not requiring PA) |
| A0425 | Ground mileage (listed as not requiring PA) |
| A0426 | Ambulance service, advanced life support, non-emergency transport (duplicate mentions in history; listed as not requiring PA) |
| A0427 | Ambulance service, transportation, specialty care (listed as not requiring PA) |
| A0428 | Ambulance service, basic life support, non-emergency transport (listed as not requiring PA) |
| A0429 | Ambulance service, basic life support, emergency transport (listed as not requiring PA) |
| A0433 | Advanced life support, level 2 (listed as not requiring PA) |
Provider responsibilities, authorization, and documentation
Prior authorization guidance
Providers should follow applicable prior authorization processes and CMS guidance. Although certain non-emergent ground ambulance HCPCS codes are not listed on PHP's prior authorization grid, check payer-specific prior authorization portals or instructions for any member-specific or plan-specific PA requirements before rendering services.
- Follow PHP and payer portals for PA requests where applicable
- Refer to current CMS guidance, LCDs/NCDs, and PHP publication history for PA policy changes
Required documentation
Ambulance suppliers must maintain and, upon request, furnish complete and accurate documentation demonstrating medical necessity. Required documentation may include physician certification of medical necessity (for repetitive non-emergent transports certification dated no earlier than 60 days prior to service), a detailed description of the patient’s condition at time of transport, point of pickup, miles/dispatch record, and for hospital-to-hospital transports, the specific treatment or specialist requested.
- Physician certification of medical necessity (repetitive services: dated ≤60 days before service)
- Detailed description of patient condition consistent with supporting records (symptoms, functional status, safety issues, monitoring)
- Point of pickup, number of miles, and dispatch record
- For hospital-to-hospital transports, indicate specific treatment or specialist
- Bed confinement is not sole criterion; to document bed confinement, show inability to (1) get up without assistance, (2) ambulate, and (3) sit in a chair/wheelchair
Documentation expectations
When PHP follows specific external guidelines (LCDs, NCDs, MCG, NCCN, CMS manuals), providers are expected to maintain or have access to those source documents and any supporting medical records for review. Failure to provide documentation demonstrating that ambulance services were reasonable and necessary per Social Security Act Section 1862(a)(1)(A) and applicable federal regulations may result in denial of payment.
- Maintain access to applicable LCDs/NCDs, CMS IOM, and other guideline sources relied upon for coverage determinations
- Be prepared to produce supporting medical records upon request to substantiate medical necessity
- Lack of documentation showing services were reasonable and necessary is a trigger for denial
Triggers for denial
Any ambulance transport that does not meet medical necessity criteria — for example, non-emergent transport that could have been safely and effectively provided at the point of origin — may be denied. PHP will not pay for items or services that are not reasonable and necessary under applicable law and policy.
- Non-emergency transports where the service could have been safely provided at point of origin may be non-covered
- Ambulance services used solely for convenience or when the member refuses assessment/transport are excluded
Policy definitions
Background and scope
Emergency ambulance services respond to sudden-onset or acute conditions where absence of immediate attention could jeopardize the patient’s health, impair bodily functions, or cause serious dysfunction. Medical necessity for ambulance transfer exists when the member’s condition makes other means of transportation contraindicated and would endanger the eligible recipient’s health. High-risk or emergency transports should be dispatched in accordance with local 911 or equivalent protocols and delivered to an appropriate facility able to provide the required level of care.
Policy revision history
Policy reviewed by committee; last review date recorded as 10-23-2024.
Annual review completed; reviewed by medical policy committee on 09-08-2023 with no criteria changes after Novitas LCD L35048 review.
Original effective date for related Commercial Benefit Interpretation Manual and Medicare references established 02-28-2000 (publication history notes).
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