Mary Ellen O'Brien, NMD, FNP
Family Nurse Practitioner · Tempe, AZ
Mary Ellen O'Brien, NMD, FNP is a family nurse practitioner with a practice address in Tempe, Arizona, and NPI 1285750240, issued on Mar 22, 2007. Check the license (Arizona RN087042, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Ellen O'Brien
- Credential
- NMD, FNP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License numbers
- RN087042 AZ
97-514 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 2127 E Baseline RD, Tempe, AZ 85283
- Phone
- (480) 491-1716
- Enumerated
- Mar 22, 2007
- Record last updated
- Sep 11, 2025
- Fax
- (480) 491-5920
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 5,933 in Arizona → Look up another NPI →
Also registered at 2127 E Baseline RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Ellen O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Arizona board licenses this profession
Search for license RN087042Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average family nurse practitioner in 2024
87 Medicare Part D claims for 12 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Most prescribed
- Levothyroxine Sodium31 claims
- Liothyronine Sodium20 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: $164.50
7 payments; by number, the most common kind was food and beverage; the largest payer was Daiichi Sankyo Inc. 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.
Mary Ellen O'Brien among 5,933 family nurse practitioner records in Arizona
Mary Ellen O'Brien, NMD, FNP is one of 5,933 family nurse practitioner records with a practice address in Arizona. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 9% of them.
- NPI issued2007 · 9% of these records are older, 88% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2025 · 38% 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 Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
148 family nurse practitioner records list a practice address in Tempe
They are 148 of the 4,310 NPPES records with a practice address in Tempe, and 5,933 family nurse practitioner records in Arizona.
All 5,933 in Arizona → Every provider in Tempe → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Amelia Adames-Zamora, FNP-CTempe, AZ 852831306210364
- Michelle Anderson, FNP-BCGuadalupe, AZ 852831063725265
- Olubukola Aremu, FNP-CTempe, AZ 852831376901199
- Gwendolyn Astudillo-Tee, FNP, RNTempe, AZ 852831306899653
- Renee Chase, MS-FNPTempe, AZ 852831538301015
- Joan Cobb, MSN, APN, FNP-BCTempe, AZ 852831003282344
- Sarah Derubeis, FNP-CTempe, AZ 852831912208430
- Julie Desoe, APRNTempe, AZ 852831275798464
Common questions
What is Mary Ellen O'Brien, NMD, FNP's NPI number?
Mary Ellen O'Brien, NMD, FNP's National Provider Identifier (NPI) is 1285750240, issued on Mar 22, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mary Ellen O'Brien, NMD, FNP located?
The NPPES record lists a practice address at 2127 E Baseline RD, Tempe, AZ, 85283. Phone: (480) 491-1716. Providers update this record themselves, so call before visiting.
How can I verify Mary Ellen O'Brien, NMD, FNP's license?
NPPES lists Arizona license number RN087042, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Ellen O'Brien, NMD, FNP prescribe under Medicare Part D?
In 2024, Mary Ellen O'Brien, NMD, FNP had 87 Medicare Part D claims for 12 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.