Mary Grace Nitro Thomas, FNP-C
Family Nurse Practitioner · Duarte, CA
Mary Grace Nitro Thomas, FNP-C is a family nurse practitioner with a practice address in Duarte, California, and NPI 1093420747, issued on Jan 17, 2023. Check the license (California 95022511, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Grace Nitro Thomas
- Credential
- FNP-C
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 95022511 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1500 Duarte RD, Duarte, CA 91010
- Phone
- (844) 946-4333
- Enumerated
- Jan 17, 2023
- Record last updated
- Nov 12, 2025
- Medicare enrollment
- Enrolled (PECOS I20230630001649); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 16,966 in California → Look up another NPI →
Also registered at 1500 Duarte RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Grace Nitro Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 95022511Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average family nurse practitioner in 2024
131 Medicare Part D claims for 48 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Most prescribed
- Sulfamethoxazole-Trimethoprim14 claims
- Fluconazole13 claims
- Lorazepam12 claims
- Prochlorperazine Maleate12 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.
Industry payments in 2024: $239.95
6 payments; by number, the most common kind was food and beverage; the largest payer was Incyte Corporation. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- City OF Hope Medical FoundationDuarte, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Grace Nitro Thomas among 16,966 family nurse practitioner records in California
Mary Grace Nitro Thomas, FNP-C is one of 16,966 family nurse practitioner records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 75% of them.
- NPI issued2023 · 75% of these records are older, 17% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2022 · median 2019 among the 6,793 with a school on file
- Record last updated2025 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
96 family nurse practitioner records list a practice address in Duarte
They are 96 of the 1,287 NPPES records with a practice address in Duarte, and 16,966 family nurse practitioner records in California.
All 16,966 in California → Every provider in Duarte → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Patricia Ash, NPDuarte, CA 910101477611549
- Elizabeth Bautista, NURSE PRACTITIONERDuarte, CA 910101609172303
- Rhodelynn BonnerDuarte, CA 910101043472988
- Gemmalin Endriga, NURSE PRACTITIONERDuarte, CA 910101821250929
- Marjorie Hein, FNPDuarte, CA 910101720244478
- Tracy Lammers, NPDuarte, CA 910101508002528
- Billie Lynes, NPDuarte, CA 910101750592424
- Lydia Mormann, FNPDuarte, CA 910101891965836
Common questions
What is Mary Grace Nitro Thomas, FNP-C's NPI number?
Mary Grace Nitro Thomas, FNP-C's National Provider Identifier (NPI) is 1093420747, issued on Jan 17, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Mary Grace Nitro Thomas, FNP-C located?
The NPPES record lists a practice address at 1500 Duarte RD, Duarte, CA, 91010. Phone: (844) 946-4333. Providers update this record themselves, so call before visiting.
How can I verify Mary Grace Nitro Thomas, FNP-C's license?
NPPES lists California license number 95022511, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Grace Nitro Thomas, FNP-C prescribe under Medicare Part D?
In 2024, Mary Grace Nitro Thomas, FNP-C had 131 Medicare Part D claims for 48 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.