Gretchen Marie Nonawzki, DO
Emergency Medicine Physician · Sacramento, CA
Gretchen Marie Nonawzki, DO is an emergency medicine physician with a practice address in Sacramento, California, and NPI 1871159392, issued on May 10, 2019. Check the license (California 20A23881, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gretchen Marie Nonawzki
- Credential
- DO
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 20A23881 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2025 Morse Ave, Sacramento, CA 95825
- Phone
- (916) 973-5000
- Enumerated
- May 10, 2019
- Record last updated
- Jul 2, 2025
- Medicare enrollment
- Enrolled (PECOS I20251020001901); accepts Medicare assignment
- Medical or professional school
- University Of New England, College Of Osteo Medicine, 2019
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 2025 Morse Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gretchen Marie Nonawzki in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A23881Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average emergency medicine physician in 2024
106 Medicare Part D claims for 70 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin14 claims
- Prednisone13 claims
- Doxycycline Hyclate12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Permanente Medical Group IncSacramento, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gretchen Marie Nonawzki among 7,751 emergency medicine physician records in California
Gretchen Marie Nonawzki, DO is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 85% of them.
- NPI issued2019 · 85% of these records are older, 12% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2019 · median 2011 among the 4,560 with a school on file
- Record last updated2025 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
369 emergency medicine physician records list a practice address in Sacramento
They are 369 of the 33,083 NPPES records with a practice address in Sacramento, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Sacramento → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Laura Bultman, MDSacramento, CA 958251235105321
- Lynn Chien, MDSacramento, CA 958251083792576
- Kenneth Collins, MDSacramento, CA 958251881772564
- Fredrick Delgado, MDSacramento, CA 958251972681666
- Troy Falck, MDSacramento, CA 958251245318997
- Hernando Garzon, MDSacramento, CA 958251235217910
- Stephen Hall, MDSacramento, CA 958251891873501
- Michael Luszczak, D.O.Sacramento, CA 958251780610675
Common questions
What is Gretchen Marie Nonawzki, DO's NPI number?
Gretchen Marie Nonawzki, DO's National Provider Identifier (NPI) is 1871159392, issued on May 10, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Gretchen Marie Nonawzki, DO located?
The NPPES record lists a practice address at 2025 Morse Ave, Sacramento, CA, 95825. Phone: (916) 973-5000. Providers update this record themselves, so call before visiting.
How can I verify Gretchen Marie Nonawzki, DO's license?
NPPES lists California license number 20A23881, 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.
How much does Gretchen Marie Nonawzki, DO prescribe under Medicare Part D?
In 2024, Gretchen Marie Nonawzki, DO had 106 Medicare Part D claims for 70 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
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.
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.