A Geographic Practice Cost Index (GPCI) by state page is a starting point, not a payment answer. Medicare doesn’t adjust payment by state — it adjusts payment by payment locality, and for 2026 there are 112 of these localities nationwide, according to CMS’s locality configuration data. Thirty-four localities are statewide (one locality covers the entire state), while the other 78 localities are split across just 16 states, some of which — like California, Texas, and Georgia — contain five or more distinct localities with different Work, Practice Expense (PE), and Malpractice (MP) GPCI values.
That distinction matters because two clinics in the same state, even the same specialty, can see meaningfully different Medicare payment for the identical CPT code if they sit in different localities.
Why State-Level GPCI Is a Starting Point, Not an Answer
GPCI (Geographic Practice Cost Index) is CMS’s mechanism for adjusting the Medicare Physician Fee Schedule (MPFS) for regional differences in the cost of delivering care. It does not change the relative value of a CPT code’s clinical work — it adjusts how much that work, along with practice overhead and liability insurance costs, is worth in dollars once payment is calculated in a specific location.
A “GPCI by state” view is genuinely useful for narrowing down which market you’re in, but it can be misleading if treated as the final number. Consider California: the 2026 GPCI data shows San Francisco-Oakland-Berkeley with a Work GPCI of 1.095 and PE GPCI of 1.410, while “Rest of California” carries a Work GPCI of 1.017 and PE GPCI of 1.096. Both are “California,” but the payment impact is not the same. If you’re estimating reimbursement or benchmarking wRVU-based compensation against local Medicare rates, you need the locality that actually covers the practice’s ZIP code or county — not a statewide average.
Practical rule: use state pages to identify which localities exist in that state; use the specific locality — via a tool like the GPCI calculator — for any actual payment estimate.
GPCI Has Three Components, Not One
This is the single most common misunderstanding in GPCI discussions: there is no single “GPCI number” for a locality. GPCI is split into three components, each tied to a different RVU component in the Medicare Physician Fee Schedule.
| GPCI Component | Adjusts This RVU Component | Reflects |
|---|---|---|
| Work GPCI | Work RVU | Physician time, skill, and intensity, adjusted for local cost-of-living/labor differences |
| PE GPCI | Practice Expense RVU | Local cost of rent, staff wages, equipment, and supplies |
| MP GPCI | Malpractice RVU | Local cost of professional liability insurance |
Each CPT code has its own mix of Work RVU, PE RVU, and MP RVU (published annually by CMS in the National Physician Fee Schedule Relative Value File). A cognitive service like an office visit is typically PE-heavy in the non-facility setting, while a high-risk surgical CPT code can carry a much larger malpractice RVU share. Because the GPCI multipliers apply to different RVU components, the same locality can rank as favorable for one CPT code and unfavorable for another, depending on that code’s component mix.
How Medicare payment is actually assembled:
\(\text{Payment} = \big((\text{Work RVU} \times \text{Work GPCI}) + (\text{PE RVU} \times \text{PE GPCI}) + (\text{MP RVU} \times \text{MP GPCI})\big) \times \text{Conversion Factor}\)
This is why a single “GPCI” figure — averaged across components — is not something CMS publishes or uses in the actual payment formula. If you’re using an RVU calculator to estimate reimbursement, it needs Work, PE, and MP GPCI as three separate inputs, not one blended number.
Two Permanent GPCI Floors You Need to Know
CMS applies statutory floors to certain GPCI components, and these floors are frequently misunderstood as temporary when they are now permanent law.
- Work GPCI floor of 1.0: No locality’s Work GPCI can fall below 1.0 for payment purposes. This floor, once subject to periodic expiration, was made permanent by the Bipartisan Budget Act of 2018. In the 2026 GPCI file, Alabama’s “raw” Work GPCI is 0.988, but the payable Work GPCI is floored at 1.000.
- Alaska’s 1.5 Work GPCI floor: Permanent under Section 1848(e)(1)(G) of the Social Security Act since 2009, giving Alaska the highest Work GPCI in the country — 1.500 for 2026.
- Frontier state PE GPCI floor of 1.0: Permanent for designated frontier states (states where at least 50% of counties have a population density under 6 people per square mile), effective since 2011.
These floors mean two things for anyone reading raw CMS data: first, don’t assume the “without floor” GPCI column is the payable figure — check whether a floor applies. Second, floors apply to specific components (mostly Work and, for frontier states, PE) — they don’t touch MP GPCI, which is why malpractice-heavy CPT codes can still show wide swings between localities even in floored states.
A Worked Example: Same CPT Code, Different Localities
Assume an illustrative office-based CPT code with Work RVU = 1.00, PE RVU = 0.90, MP RVU = 0.08 (total RVU = 1.98). These are example values for demonstrating the calculation method, not an actual published CPT code’s RVU data. Using the CY 2026 non-facility conversion factor for non-qualifying APM participants of $33.4009, here’s how the same code prices out in two different localities using real 2026 GPCI values:
| Locality | Work GPCI | PE GPCI | MP GPCI | GPCI-Adjusted Total RVU | Estimated Payment |
|---|---|---|---|---|---|
| Rest of Alabama (statewide) | 1.000 | 0.875 | 0.566 | 1.00(1.000) + 0.90(0.875) + 0.08(0.566) = 1.833 | 1.834 × $33.4009 ≈ $61.22 |
| San Francisco-Oakland-Berkeley, CA | 1.095 | 1.410 | 0.425 | 1.00(1.095) + 0.90(1.410) + 0.08(0.425) = 2.398 | 2.398 × $33.4009 ≈ $80.10 |
GPCI values above are drawn from CMS’s finalized CY 2026 GPCI data by locality. The roughly 31% payment difference between these two localities for an identical CPT code is entirely attributable to geography — nothing about the underlying clinical work RVU changed. This is the calculation the Medicare reimbursement calculator automates once you select CPT code, locality, and setting.
Non-Facility PE vs. Malpractice Sensitivity
Not every code is sensitive to GPCI in the same way, and grouping “high GPCI impact” services together without separating PE from MP produces misleading comparisons.
- Office-based, PE-heavy services (E/M visits, many outpatient procedures) are most sensitive to the non-facility PE GPCI, since that setting assigns the practice — not a hospital or ASC — the overhead cost. A code priced with the facility PE RVU will show a smaller geographic swing because part of the overhead is absorbed by the facility rather than the physician’s practice.
- Procedure-heavy, higher-liability services (many surgical CPT codes) carry a larger MP RVU share, so MP GPCI differences — like Florida’s Miami locality at 2.529 MP GPCI versus Fort Lauderdale’s 1.808 in the same state for 2026 — can dominate the payment variance even when Work and PE GPCI are similar. cgm
When documenting any GPCI-based comparison for compensation benchmarking or payer modeling, record four things every time: the specific CPT code, the setting (facility vs. non-facility), the exact locality (not the state), and the participant status (qualifying APM vs. non-qualifying APM), since the two 2026 conversion factors — $33.5675 and $33.4009 — produce different final numbers even with identical RVUs and GPCI.
Don’t Confuse GPCI-Adjusted Payment With wRVU Compensation
A separate but related error is conflating GPCI-adjusted Medicare payment with wRVU-based physician compensation. Work GPCI adjusts Medicare’s payment formula; it does not typically adjust the wRVU figure a practice uses to calculate a physician’s productivity-based compensation. Most physician compensation plans multiply raw wRVUs (unadjusted for geography) by an internally negotiated or market-benchmarked conversion rate — a dollar-per-wRVU figure set by the employer, not by CMS. That compensation rate already reflects local labor market conditions in its own way, so applying Medicare’s Work GPCI on top of it double-counts geography and produces an inflated, non-standard number. If you’re modeling both sides — what Medicare pays for a service and what a physician earns for performing it — keep the wRVU calculator output and the GPCI-adjusted Medicare payment estimate as two separate figures, not one blended calculation.
Using Locality Data Correctly
To translate GPCI into a defensible payment or compensation estimate:
- Identify the exact CPT or HCPCS code and confirm its published Work RVU, PE RVU (facility and non-facility), and MP RVU for the applicable year.
- Confirm the payment locality — not just the state — using the practice’s actual ZIP code or county.
- Pull that locality’s Work, PE, and MP GPCI values separately, checking whether a statutory floor applies.
- Apply the correct conversion factor for the participant’s APM status.
- Multiply and sum per the formula above, and state clearly whether the result is an estimated Medicare-allowed amount, not a guaranteed claim payment — actual claims can differ due to sequestration, MIPS payment adjustments, site-of-service differentials, or bundling edits not reflected in a base RVU calculation.
Because GPCI values, conversion factors, and even the number of conversion factors change from year to year — 2026 marked the first year CMS split the CF into separate qualifying-APM and non-qualifying-APM rates — always confirm you’re working with the current calendar year’s GPCI and CF release before finalizing any comparison, and treat any GPCI table as tied to a specific effective year rather than a permanent reference number.