NPPES file of Aug 9, 2026

James Allen Willis, M.D.

Pain Medicine (Anesthesiology) Physician · Auburn, CA

James Allen Willis, M.D. is a pain medicine (anesthesiology) physician with a practice address in Auburn, California, and NPI 1538153127, issued on Sep 9, 2005. Check the license (California G37443, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2023 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1538153127
Name
James Allen Willis
Credential
M.D.
Primary taxonomy
Pain Medicine (Anesthesiology) Physician 207LP2900X
License number
G37443 CA
Self-reported in NPPES; status is on the state search
Practice location
11971 Heritage Oak PL, Auburn, CA 95603
Phone
(530) 745-9615
Enumerated
Sep 9, 2005
Record last updated
May 14, 2014 (not updated in 12 years: call before relying on the address or phone)
Fax
(530) 745-9610
Medicaid ID
GR0028370 CA
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest pain medicine (anesthesiology) physician records → All 536 in California → Look up another NPI →

Verify James Allen Willis in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G37443    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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The practice group's MIPS final score for 2023 (Medicare payment program): 83.2 of 100

The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.

  1. Qualityout of 100 · 30% of the final score63.4
  2. Costout of 100 · 30%71.4
  3. Promoting interoperabilityout of 100 · 25%100.0
  4. Improvement activities40 of 40 points · 15%100.0

Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).

James Allen Willis among 536 pain medicine (anesthesiology) physician records in California

James Allen Willis, M.D. is one of 536 pain medicine (anesthesiology) physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 95% newer
  • In a Medicare fileYes · 83% of these records are
  • In the CMS Doctors and Clinicians fileNo · 68% of these records are
  • Record last updated2014 · 51% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207LP2900X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Pain Medicine (Anesthesiology) Physician providers in California

There are 536 pain medicine (anesthesiology) physician records in California.

All 536 in California → Every provider in Auburn → Pain Medicine (Anesthesiology) Physician nationwide →

The 8 pain medicine (anesthesiology) physician records with the nearest ZIP codes

  1. Hai DuongDavis, CA 956161760646152
  2. Brian Kim, M.D.Citrus Heights, CA 956211902241573
  3. T Maroon, M.D.Roseville, CA 956611720056153
  4. Samir Sheth, MDRoseville, CA 956611720245830
  5. Robert Jarka, M.D.Placerville, CA 956671003867359
  6. Albert Lin, MDRancho Cordova, CA 956701376935726
  7. Shahram Abbassi, MDArcata, CA 955211396774139
  8. Damoon Rejaei, MDVacaville, CA 956881932475548

Common questions

What is James Allen Willis, M.D.'s NPI number?

James Allen Willis, M.D.'s National Provider Identifier (NPI) is 1538153127, issued on Sep 9, 2005. An NPI identifies a provider in billing; it is not a license.

Where is James Allen Willis, M.D. located?

The NPPES record lists a practice address at 11971 Heritage Oak PL, Auburn, CA, 95603. Phone: (530) 745-9615. Providers update this record themselves, so call before visiting.

How can I verify James Allen Willis, M.D.'s license?

NPPES lists California license number G37443, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

What is James Allen Willis, M.D.'s MIPS final score?

The 2023 MIPS final score is 83.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.