Guide

GPCIs and localities: the geography inside your rates

Summary

Medicare pays the same code differently by location because its fee schedule adjusts each service's relative value units for local costs. Three geographic practice cost indices — one for physician work, one for practice expense, one for malpractice — scale a code's value up or down for your payment locality, then a national conversion factor turns the result into dollars. Two offices in different localities bill the identical code and are paid different amounts.

By Gale Editorial · Updated 2026-07-26. Every figure cited to a dated source. How we write.

Why the same code pays differently by location

Medicare does not pay a flat national price for a service. Its Physician Fee Schedule builds each code's payment from relative value units and then multiplies by a single national conversion factor, and the whole schedule is published and updated every year through rulemaking 1Ref 1Centers for Medicare & Medicaid Services (2026).Physician Fee Schedule.That the Medicare Physician Fee Schedule builds each code's payment from relative value units and a national conversion factor and is updated annually through rulemaking — the framework the geographic adjustment sits inside.. What sits between the code and the dollars is geography: before that final multiplication, each code's value units are scaled for where the service is furnished. That is why two offices billing the identical code, on the same day, are paid different amounts.

The adjustment is done with a set of indices called geographic practice cost indices — GPCIs. Each one measures how a particular cost of running a practice compares to the national average in your area. A locality where office rent, wages, and malpractice premiums run high carries indices above the national baseline and is paid more; a lower-cost locality carries indices below it and is paid less. The code is national; the price is local.

The formula: three cost components, three indices

A code's Medicare payment comes from three relative value units added together, each adjusted by its own geographic index, then converted to dollars 1Ref 1Centers for Medicare & Medicaid Services (2026).Physician Fee Schedule.That the Medicare Physician Fee Schedule builds each code's payment from relative value units and a national conversion factor and is updated annually through rulemaking — the framework the geographic adjustment sits inside.. The three components are physician work, practice expense, and malpractice. Medicare multiplies each component's value units by the matching GPCI for your locality, sums the three, and multiplies the total by the conversion factor to reach the allowed amount.

The practical takeaway is that geography does not move every code by the same amount. Physician work is a large share of an office visit but a smaller share of a procedure heavy on supplies and staff time, so a shift in the practice-expense index moves a supply-intensive code more than it moves a straight evaluation-and-management visit. You do not have to run this arithmetic by hand — Medicare publishes the finished, locality-specific dollar figure for every code 2Ref 2Centers for Medicare & Medicaid Services (2026).Physician Fee Schedule Search.That CMS's Physician Fee Schedule search tool returns the national and locality-specific payment amount, the relative value units, and the facility and non-facility payment indicators for any CPT or HCPCS code. — but knowing the shape of the formula explains why your rates rise and fall the way they do when a locality's indices are updated.

What a payment locality actually is

A payment locality is the geographic area Medicare uses to assign your GPCIs, and it is set by where the service is furnished — for an office-based solo, your practice address. Some localities cover an entire state; others split a state into metropolitan and rural areas, so a practice on one side of a county line can sit in a different locality than one a few miles away. Your address maps to a single locality, and that locality's three indices drive every code you bill.

Claims for your locality are processed by the regional contractor that serves your jurisdiction, and CMS publishes which contractor — your MAC — that is 3Ref 3Centers for Medicare & Medicaid Services (2026).Medicare Administrative Contractors.That Medicare claims are administered regionally and CMS publishes which MAC and jurisdiction a practice's address falls under — the basis for confirming your locality.. When you move your practice, you may move localities, and your Medicare rates can shift even though nothing about your codes changed. It is worth checking your locality when you sign a new lease, not after the first remittance looks different than you expected.

How to find your locality's real payment

The exact amount Medicare allows for one of your codes in your area is a lookup, not a calculation. CMS runs a public Physician Fee Schedule search tool that returns the national and the locality-specific payment, the underlying relative value units, and the payment indicators for any CPT or HCPCS code 2Ref 2Centers for Medicare & Medicaid Services (2026).Physician Fee Schedule Search.That CMS's Physician Fee Schedule search tool returns the national and locality-specific payment amount, the relative value units, and the facility and non-facility payment indicators for any CPT or HCPCS code.. Enter your most-billed codes, choose your MAC and locality, and read the dollars for your own area rather than a national average that will not match your remittance.

The same tool shows two payment amounts for many codes: a facility and a non-facility rate. That facility vs non-facility split is a site-of-service adjustment, separate from geography — the practice-expense component is higher when you carry the overhead in your own office than when the service happens inside a hospital. For an office-based solo, the non-facility amount is usually the one that applies. Pull both so you know which figure your claim should land on.

Geography is not the only thing bending your rate

Location sets your GPCIs, but several other adjustments sit on top of the locality-adjusted amount before you are actually paid. The site-of-service difference above is one. Another is the Merit-based Incentive Payment System, which scores enrolled Part B clinicians and can raise or lower their Medicare payments, though many true solos fall under its low-volume threshold and are excluded 4Ref 4Centers for Medicare & Medicaid Services (2026).MIPS Overview.That MIPS scores enrolled Part B clinicians and adjusts their Medicare payment, while low-volume-threshold clinicians are excluded — one of the non-geographic adjustments layered on the allowed amount.. Your participation posture and any secondary coverage change what you ultimately collect as well.

The point is not to track every lever, but to know that the number in the fee-schedule tool is a starting point, not your final deposit. If your payments look off, the locality-adjusted allowed amount is the first thing to confirm, and the adjustments layered on top of it are the second.

Using the locality-adjusted amount to set your own fees

Medicare's locality-adjusted allowed amount is the most useful anchor a solo has for pricing, because it already reflects your area's costs. Many practices set their master fee schedule as a multiple of Medicare and let the locality figure do the geographic work for them. When you build your fee schedule, pulling your top codes' locality amounts gives you a defensible basis and a consistent starting point for every payer, which is why pricing off Medicare is such a common convention.

The one move to avoid is billing below the allowable. If your posted charge for a code is lower than a payer's allowed amount, most payers pay the lesser of the two — your charge — so an under-set charge quietly caps your own collection. Setting your charge at or above the highest allowable you see across your contracts keeps that from happening. The geography is already built into the number; the job is not to leave money sitting behind it.

Common questions

Generally the location where the service is furnished — for an office visit, your practice address — sets the payment locality and the GPCIs, not the patient's home ZIP. Telehealth and some site-of-service situations have their own rules, so confirm the current-year guidance for those. For an ordinary in-office service, your own address is what maps to the locality.

A move can put you in a different payment locality with different geographic indices, so the same codes are paid different amounts even though nothing about your coding changed. Check your new locality in the fee-schedule tool when you sign a lease, and confirm which MAC and locality your new address falls under, so the shift is expected rather than a surprise on the first remittance.

No. The geographic indices, the relative value units, and the conversion factor are all revisited each year through Medicare's annual rulemaking, so a locality's payments can move from one year to the next. Treat any figure you looked up as current-year only, and re-check your top codes when the new schedule publishes.

Use CMS's Physician Fee Schedule search tool. Enter the code, choose your MAC and locality, and it returns the national and locality-specific allowed amounts, the relative value units, and the facility and non-facility rates. That locality-specific figure is what your remittance should reflect, not the national average often quoted in summaries.

Many commercial contracts price as a percentage of the Medicare fee schedule, which carries the locality adjustment along with it, but each contract controls and some use their own fee schedules entirely. Do not assume a commercial rate tracks Medicare's geography — read the contract's basis, and look up the Medicare locality amount so you know what the multiple is being applied to.

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References

1.Centers for Medicare & Medicaid Services (2026). Physician Fee Schedule. Centers for Medicare & Medicaid Services (CMS). link ✓That the Medicare Physician Fee Schedule builds each code's payment from relative value units and a national conversion factor and is updated annually through rulemaking — the framework the geographic adjustment sits inside.
2.Centers for Medicare & Medicaid Services (2026). Physician Fee Schedule Search. Centers for Medicare & Medicaid Services (CMS). link ✓That CMS's Physician Fee Schedule search tool returns the national and locality-specific payment amount, the relative value units, and the facility and non-facility payment indicators for any CPT or HCPCS code.
3.Centers for Medicare & Medicaid Services (2026). Medicare Administrative Contractors. Centers for Medicare & Medicaid Services (CMS). link ✓That Medicare claims are administered regionally and CMS publishes which MAC and jurisdiction a practice's address falls under — the basis for confirming your locality.
4.Centers for Medicare & Medicaid Services (2026). MIPS Overview. CMS Quality Payment Program. link ✓That MIPS scores enrolled Part B clinicians and adjusts their Medicare payment, while low-volume-threshold clinicians are excluded — one of the non-geographic adjustments layered on the allowed amount.

https://www.gale.care/for-providers/mc-geographic-adjustment-gpci · 4 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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