DR. MARY ELLEN O'BRIEN NMD, FNP
NPI 1285750240
Nurse Practitioner - Family in Tempe, AZ

Q: What is Mary O'brien's NPI number?

The NPI number for Mary O'brien is 1285750240. It was assigned to this individual provider in the NPPES registry on March 22, 2007.

Q: What is Mary O'brien's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Q: Is Mary O'brien enrolled in Medicare?

No. Mary O'brien has opted out of Medicare through April 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for Mary O'brien was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 22, 2007Opted out of Medicare · through Apr 1, 2027

2127 E BASELINE RD, SUITE 103, TEMPE, AZ 85283(480) 491-1716(480) 491-5920 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

On this page

About Dr. Mary Ellen O'brien Nmd, Fnp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARY ELLEN O'BRIEN NMD, FNP (NPI 1285750240) is an individual family provider in Tempe, Arizona, licensed in Arizona (RN087042) and active in the NPI registry since March 2007. She has opted out of Medicare through April 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1285750240

Entity TypeIndividualFemale

Primary Taxonomy363LF0000X

Provider Legal NameDR. MARY ELLEN O'BRIENCredential: NMD, FNP

Location Address2127 E BASELINE RD, SUITE 103Tempe, AZ 85283-1537

Mailing Address8325 E Keim DrScottsdale, AZ 85250-5847 · (480) 481-7872

Phone(480) 491-1716

Fax(480) 491-5920

Sole ProprietorYes

Enumeration DateMarch 22, 2007

Last NPPES UpdateSeptember 11, 2025

✔ NPI 1285750240 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LF0000X

License✔ Licensed in AZ · RN087042

Also ListedNaturopathTaxonomy 175F00000X · License 97-514 (AZ)

2127 E BASELINE RD, Tempe, AZ 85283

Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. Mary Ellen O'brien Nmd, Fnp has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from April 1, 2017 through April 1, 2027.

Opt-Out Effective DateApril 1, 2017

Opt-Out In Effect ThroughApril 1, 2027Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 85283 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$85.89 typical visit price

range $55.44 – $168.60

Typical copayment $21.47 (range $13.86 – $42.15)

Most-billed visit code 99203

Established Patient

$98.00 typical visit price

range $17.72 – $137.41

Typical copayment $24.50 (range $4.43 – $34.35)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ARIZONA FAMILY PHYSICIANS

Family Medicine

2127 E BASELINE RD, 104
TEMPE, AZ 85283

Maricopa County (480) 897-7070

OLIVIA LYNN BARTOLA LMT

Massage Therapist

2127 E BASELINE RD, SUITE 101
TEMPE, AZ 85283

Maricopa County (480) 377-1226

DEANNA PALMER L.M.T.

Massage Therapist

2127 E BASELINE RD, 101
TEMPE, AZ 85283

Maricopa County (480) 377-1226

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mary O'brien's NPI number?

The NPI number for Mary O'brien is 1285750240. It was assigned to this individual provider in the NPPES registry on March 22, 2007.

Where is Mary O'brien located?

Mary O'brien practices at 2127 E Baseline Rd Suite 103, Tempe, AZ 85283. The listed phone number is (480) 491-1716.

What is Mary O'brien's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Mary O'brien enrolled in Medicare?

No. Mary O'brien has opted out of Medicare through April 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Mary O'brien was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.