How an ambulance ride is priced: base rate, mileage and who pays

The five terms a ground ambulance bill is built from

• Base rate. A flat charge for the transport at one service level. It pays for the vehicle, the crew and everything used on the trip, and it is the larger of the two numbers on most bills.
• Loaded mileage. The miles the patient was actually in the vehicle, measured from pickup to arrival. CMS defines it as the number of miles the Medicare beneficiary is transported in the ambulance vehicle.
• Service level. Basic life support (BLS), advanced life support level 1 or 2 (ALS1, ALS2), or specialty care transport (SCT). Each has its own billing code, and the emergency versions are billed higher than the non-emergency ones.
• Point of pickup. The ZIP code where the patient was put in the vehicle. It decides which locality index applies and whether the trip is urban or rural.
• Allowed amount. What a payer will recognize for the trip. For Medicare it is the fee schedule amount or the supplier's charge, whichever is lower.

Everything below follows from those five terms. The Medicare numbers come from the CMS ambulance fee schedule public use file for calendar year 2026, which CMS posted on March 10, 2026 and which we read on October 23, 2026. They are Medicare payment amounts for Medicare patients. They are not a price list, and no ambulance operator is required to charge them to anyone else.

How CMS builds the base rate, with one trip checked by hand

The national base rate for 2026 in the public use file is $284.56. That figure is multiplied by a relative value that rises with the level of service, and then adjusted for where the trip started. CMS states the formula for an urban ground base rate as the relative value units times the sum of 0.3 and 0.7 times the locality index, times the base rate, times 1.02. The 1.02 is the statutory urban add-on. For a rural pickup the final multiplier is 1.03.

Service level	Billing code	Relative value
BLS, non-emergency	A0428	1.00
BLS, emergency	A0429	1.60
ALS1, non-emergency	A0426	1.20
ALS1, emergency	A0427	1.90
ALS2	A0433	2.75
Specialty care transport	A0434	3.25
Paramedic intercept	A0432	1.75

Take a basic life support emergency trip, A0429, picked up in Detroit. The locality index for Detroit is 0.965. First, 0.3 plus 0.7 times 0.965 is 0.9755. Multiply by the 1.60 relative value to get 1.5608. Multiply by $284.56 to get $444.14, and by 1.02 to get $453.02. That matches the $453.02 printed for Detroit in the CMS file, to the cent. The same arithmetic for an advanced life support emergency trip, A0427, uses 1.90 in place of 1.60 and gives $537.97.

Two details of that formula explain most of the variation between cities. Only 70 percent of the base rate is scaled by the locality index, so the dollar spread between the lowest-index and highest-index locality is narrow next to the spread in local wages or rents. And the mileage rate is not scaled at all. A mile costs the same in every urban locality in the country, so on a long trip geography explains a smaller part of the bill and on a short trip a larger part.

Medicare base rates by level and locality, 2026

The table shows the urban base rate for the localities that bracket the range and for Detroit, the locality this site uses for its other Medicare anchors. Amounts are in dollars, from the CY2026 public use file, for pickups in an urban ZIP code.

Locality (MAC / locality code)	Index	BLS non-emerg. A0428	BLS emerg. A0429	ALS1 non-emerg. A0426	ALS1 emerg. A0427	ALS2 A0433	SCT A0434
Arkansas (07102 / 13), lowest index in file	0.859	$261.60	$418.56	$313.92	$497.05	$719.41	$850.21
Rest of Michigan (08202 / 99)	0.913	$272.57	$436.12	$327.09	$517.89	$749.58	$885.87
Detroit (08202 / 01)	0.965	$283.14	$453.02	$339.77	$537.97	$778.63	$920.20
Manhattan (13202 / 01)	1.162	$323.17	$517.06	$387.80	$614.01	$888.70	$1,050.29
Santa Clara County, California (01112 / 09), highest index in file	1.442	$380.05	$608.09	$456.07	$722.10	$1,045.15	$1,235.18

From the lowest-index locality to the highest, the same BLS emergency base rate runs from $418.56 to $608.09, a difference of $189.53, while the index runs from 0.859 to 1.442. The 30 percent fixed share of the formula is why the dollar difference is smaller than the index difference would suggest. What the table does not show is the operator's side of the story: a county service and a private company in the same locality will typically publish different rates, and Medicare pays whichever is lower for a Medicare patient.

Mileage: loaded miles only, and the rural step

The mileage code for ground ambulance is A0425, billed per mile. The CMS claims manual says charges for mileage must be based on loaded mileage only, from the pickup of the patient to arrival at the destination, and that it is presumed unloaded mileage costs are taken into account in the base charge and the per-mile rate. Separate charges for unloaded mileage will be denied. The 2026 amounts for an urban pickup are $9.33 per mile. For a rural pickup, the first 17 loaded miles are paid at 1.5 times the rural mileage rate, which is $14.13 per mile, and miles from 18 onward drop back to $9.42.

Loaded miles	Urban pickup at $9.33	Rural pickup (17 miles at $14.13, then $9.42)
2	$18.66	$28.26
5	$46.65	$70.65
10	$93.30	$141.30
20	$186.60	$268.47
40	$373.20	$456.87

Two facts about mileage surprise people. First, mileage is small next to the base rate for most trips. Ten urban miles add $93.30 to a base rate that is several times that, so a bill that looks outsized almost always owes its size to the level of service or to the operator's own rates, not to distance. Second, the claim must report distance in fractions. For trips up to 100 covered miles, suppliers round the total up to the nearest tenth of a mile and report it with a decimal, for example 99.9. From 100 miles up, mileage is rounded up to the next whole mile. A bill showing a whole number of miles on a short trip is worth a second look, because the manual expects a tenth-of-a-mile figure.

Medicare also pays a rural "super-rural" bonus: a 22.6 percent increase to the base rate for ground trips that start in the lowest 25 percent of rural areas by population density. In the CMS file that column is labeled as the rural base rate for the lowest quartile. For Rest of Michigan, the rural ALS1 emergency base rate of $522.97 becomes $641.16 in a super-rural ZIP code.

Four worked trips with the Medicare share

The trips below are invented, but every rate in them is a published 2026 CMS amount. They show how base rate, miles and the 20 percent coinsurance combine. "Deductible unmet" means the Part B deductible of $283 for 2026 has not been satisfied by earlier claims that year, so the ambulance claim is where it is absorbed.

Trip	Base rate	Mileage	Medicare-approved	Patient share (20%)
A. Detroit, BLS emergency (A0429), 12 loaded miles	$453.02	12 x $9.33 = $111.96	$564.98	$113.00 if deductible met. $339.40 if unmet ($283.00 plus 20% of the remaining $281.98)
B. Rural pickup in Rest of Michigan, ALS1 emergency (A0427), 25 loaded miles	$522.97	17 x $14.13 = $240.21, plus 8 x $9.42 = $75.36	$838.54	$167.71 (deductible met)
C. Manhattan, ALS2 (A0433), 4 loaded miles	$888.70	4 x $9.33 = $37.32	$926.02	$185.20 (deductible met)
D. Detroit, specialty care transport between hospitals (A0434), 30 loaded miles	$920.20	30 x $9.33 = $279.90	$1,200.10	$240.02 (deductible met)

Trip B shows the rural rule at work: 25 miles cost $315.57 in mileage against $233.25 if the same miles had been urban. If trip B had started in a super-rural ZIP code, the base rate would be $641.16 and the approved total $956.73, with a $191.35 patient share. Trip D shows that a specialty care transfer is dominated by the base rate even at 30 miles.

Medicare pays 80 percent of the approved amount. Medicare.gov states that after the Part B deductible you pay 20 percent of the Medicare-approved amount for ground ambulance transportation. The CMS claims manual adds that payment for ambulance services may be made only on an assignment-related basis, which means an ambulance supplier billing Medicare for a covered trip accepts the Medicare-approved amount as the full charge and cannot bill the patient for the difference. That is the opposite of the commercial position described in the ground ambulance bills gap guide, where an out-of-network supplier may bill the difference between its charge and the plan's payment.

The same ten-mile ride in four localities

Because the mileage rate is the same everywhere in an urban ZIP code and the base rate is not, moving one fixed ride across the map isolates the geographic effect. The table prices a 10-mile urban trip at two service levels, with the 20 percent share after the deductible.

Locality	BLS emergency (A0429) + 10 miles	20% share	ALS1 emergency (A0427) + 10 miles	20% share
Arkansas	$418.56 + $93.30 = $511.86	$102.37	$497.05 + $93.30 = $590.35	$118.07
Detroit	$453.02 + $93.30 = $546.32	$109.26	$537.97 + $93.30 = $631.27	$126.25
Manhattan	$517.06 + $93.30 = $610.36	$122.07	$614.01 + $93.30 = $707.31	$141.46
Santa Clara County, California	$608.09 + $93.30 = $701.39	$140.28	$722.10 + $93.30 = $815.40	$163.08

Across the four localities in the table, the approved amount for the same BLS emergency ride runs from $511.86 to $701.39, and the patient's 20 percent share from $102.37 to $140.28, a difference of $37.91. Moving up one service level in the same city adds $84.95 in Detroit, so the level on the bill moves the total about as much as moving across the country does. That is the reason the first check on any ambulance bill is the level.

What the base rate already covers

Under the ambulance fee schedule, CMS says oxygen and other items and services provided as part of the transport are included in the base payment rate and are not separately payable. The claims manual lists oxygen, drugs, extra attendants, supplies, EKG testing and night differential as items that are no longer paid separately, and says a claim that includes a code which is not separately billable has that code's payment included in the base rate. So for a Medicare trip, the bill is the base code, the mileage code, and nothing else.

A private operator's invoice to a non-Medicare patient may look different, because operators set their own line items. That is where an itemized statement does its work. If the invoice lists oxygen, a medication, an EKG and a night surcharge as separate lines on top of a base rate, compare it with what the fee schedule treats as already included. This is not a claim that the charge is wrong. It is a reason to ask the billing office which items are bundled into the base charge and which are billed on top, in writing, because the answer changes the size of the invoice. The step-by-step comparison method is in the itemized-bill check.

What the level of service means on the bill

The level billed is a billing classification. In the federal definitions at 42 CFR 414.605, basic life support is transportation by ground ambulance vehicle with medically necessary supplies and services. ALS1 adds an advanced life support assessment or at least one ALS intervention, ALS2 involves, among other things, the administration of at least three medications by intravenous push or continuous infusion, and specialty care transport is interfacility transportation of a critically injured or ill beneficiary by a ground ambulance vehicle. The emergency label attaches to a response: responding immediately at the BLS or ALS1 level to a 911 call.

You are not asked to judge whether care was appropriate. The checkable questions are documentary. Does the level on the bill match the level on the trip record? Does the "emergency" code match a 911 dispatch, or was this a scheduled transfer that should be billed at a non-emergency code? The emergency code carries a bigger relative value (1.60 against 1.00 for BLS, 1.90 against 1.20 for ALS1), so in Detroit the label alone moves the approved base rate by $169.88 for BLS ($453.02 against $283.14) and $198.20 for ALS1 ($537.97 against $339.77). Ask for the trip report, which is the supplier's own record, and compare the code on the bill to the report.

Scheduled, non-emergency trips under Medicare

Medicare.gov says Medicare may cover medically necessary non-emergency ambulance transport with a written order from a doctor or other provider. It also describes a demonstration in which scheduled non-emergency trips may require prior authorization if a person has three or more round trips in ten days, or weekly trips for three weeks or more. Without approval, Medicare may deny the claim and the ambulance company may bill you. For a patient with a standing schedule of trips, that makes two documents central: the written order and, where the demonstration applies, the authorization. Ask the ambulance company which of the two it holds for your trips before the second week of a pattern, not after the first denial.

Air ambulance, for scale

Air transport is paid differently and the amounts are not close. In the CY2026 file for Detroit, the fixed-wing base rate (A0430) is $3,794.04 for an urban pickup and $5,691.06 for a rural one, and the rotary-wing base rate (A0431) is $4,411.14 urban and $6,616.72 rural. Mileage is paid per statute mile flown, at $10.96 per mile for fixed wing (A0435) and $29.23 per mile for rotary wing (A0436) in the file, with the rural rate 1.5 times the urban rate. A 100-mile fixed-wing flight in Detroit, for example, is the $3,794.04 base rate plus 100 x $10.96, or $4,890.04, and the same flight from a rural pickup is $5,691.06 plus 100 x $16.44, or $7,335.06; the 20 percent shares are $978.01 and $1,467.01. Air transport falls inside the No Surprises Act, which ground ambulance does not, as the gap guide explains.

When the patient is not on Medicare

For commercial insurance, Medicare Advantage or no insurance, no national rate card exists. The public record gives you three things to work with.

1. The operator's rate sheet. Some public agencies publish theirs on a county or city website, and any operator can be asked to send one. Ask for the base rates by level, the mileage rate, and any named surcharges.
2. Your plan's allowed amount. If you have insurance, the explanation of benefits shows what the plan recognized. See the guide to reading an explanation of benefits.
3. The Medicare anchor in the tables above. It is a yardstick for order of magnitude. If an invoice for a 10-mile BLS emergency trip is a large multiple of $546.32, that is a reason to ask what the extra lines are, not proof of an error.

There is no federal price-transparency file for ambulance operators. The hospital price transparency rule applies to hospitals, so the rule does not reach an ambulance company that is not hospital-owned. The all-in figure has to come from the operator, and you should confirm your price in writing before service whenever the ride is one you can schedule.

The bill, line by line

The invented invoice below is arranged the way many are, with a Medicare-style code beside each line. Use it as a template for what to check on your own.

Line on invoice (invented)	What to check
A0427 ALS1 emergency base, 1 unit	One unit only. Level matches the trip report. Emergency code matches a 911 response.
A0425 mileage, 14.2 miles	Loaded miles, to the nearest tenth, from your pickup address to the facility door. Compare with a map between the two addresses.
Oxygen administration, 1 unit	Under the Medicare fee schedule this is already inside the base rate. Ask the operator whether its own rate sheet bills it separately.
Night surcharge	CMS no longer pays night differential separately. Ask where it appears in the operator's rate sheet.
Patient responsibility	If you have insurance, match to the explanation of benefits. If you are on Medicare, it should be 20 percent of the approved amount after the deductible, not a balance.

Two further checks matter on multi-patient trips and intercepts. When more than one patient is on board, the supplier must flag the claim with a "GM" modifier and document the number of patients, and the Medicare payment is adjusted for the shared transport. When a paramedic from one organization meets the vehicle of another, the paramedic intercept code (A0432, relative value 1.75) can appear on a separate bill from a different company. Each bill is its own account and each answers to its own billing office.

Before you call the billing office

• Have the date, the pickup address and the destination written down, and the name on the vehicle.
• Ask for the itemized statement and the trip report, and ask whether the operator participates with your plan.
• Ask for the base rate code, the mileage figure to the tenth, and the per-mile rate, then multiply them yourself.
• If you are on Medicare, ask whether the claim was submitted to Medicare. The claims manual allows payment only on an assignment basis, so ask why you are being billed the full charge if it was not.
• If you are uninsured, ask whether the operator or its county has a financial hardship process, and ask for it in writing.

If the trip was booked in advance, such as a scheduled transfer between facilities, the price is something you can request before the vehicle arrives. Ask for the base rate, the mileage rate and an all-in total, and confirm your price in writing before service. A booked transfer is the one ambulance trip that behaves like the rest of the procedures on this site.

Frequently asked questions about ambulance rates

Where these figures come from

Centers for Medicare and Medicaid Services, Ambulance Fee Schedule Public Use Files, CY 2026 file (posted March 10, 2026; AFS2026_PUF_ext and GPCI files), https://www.cms.gov/medicare/payment/fee-schedules/ambulance/ambulance-fee-schedule-public-use-files, read October 23, 2026. CMS, Medicare Claims Processing Manual Chapter 15, Ambulance (Rev. 13464, issued 11-14-25), https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/clm104c15.pdf, read October 23, 2026. 42 CFR 414.605 and 414.610, eCFR, read October 23, 2026. Medicare.gov, Ambulance services, https://www.medicare.gov/coverage/ambulance-services, read October 23, 2026. CMS, 2026 Medicare Parts A and B premiums and deductibles fact sheet (Part B deductible $283), read October 23, 2026. Medicare amounts are payment rates for Medicare patients, not prices for anyone else.