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MARIA ALEJANDRA MASSEY MD
NPI 1518544188
Anesthesiology in Tucson, AZ

Active since March 28, 2021PECOS EnrolledAccepts Medicare Assignment
1501 N CAMPBELL AVE, TUCSON, AZ 85724(520) 626-7141(520) 626-6943 Get Directions Write a Review

NPPES record last updated: May 27, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 27, 2025, Jun 23, 2021, Mar 29, 2021 and 1 more (4 updates tracked since 2021).

About Maria Alejandra Massey Md NPPES

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

MARIA ALEJANDRA MASSEY MD (NPI 1518544188) is an individual anesthesiology provider in Tucson, Arizona, licensed in Arizona (75815) and active in the NPI registry since March 2021. She is enrolled in Medicare PECOS and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (2022).

NPPES Registry Identity

NPI1518544188
Entity TypeIndividualFemale
Primary Taxonomy207L00000X
Provider Legal NameMARIA ALEJANDRA MASSEYCredential: MD
Location Address1501 N CAMPBELL AVETucson, AZ 85724-4414
Mailing Address1501 N Campbell AveTucson, AZ 85724-0001 · (520) 626-7141 · Fax (520) 626-6943
Phone(520) 626-7141
Fax(520) 626-6943
Sole ProprietorNo
Medical School CMSUniversity Of Illinois College Of Med (chi/peor/rock/chm-urb)Graduated 2022
Enumeration DateMarch 28, 2021
Last NPPES UpdateMay 27, 20254 updates tracked since enumeration
NPPES CertifiedMay 27, 2025
✔ NPI 1518544188 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in AZ · 75815
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
Also ListedInternal MedicineTaxonomy 207R00000X · License 125.078825 (IL)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
1501 N CAMPBELL AVE, Tucson, AZ 85724
Open in Google Maps ↗

Other Names 1

Former Name (1)Dr. Maria Alejandra Alvarado

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health Plan, Inc..Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Maria Alejandra Massey Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4284016718
PECOS Enrollment IDI20250529003241, I20260415002629
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Maria Massey reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Banner-University Medical Group
5.2 mi
Nutrition, Education
535 N WILMOT RD STE 101
Tucson, AZ 85711
  • Reassigned Medicare billing, Arizona enrollment
  • 1,514 clinicians in this Medicare group
NPI 1932708328 (520) 694-5437
Permanente Medical Group Inc
708 mi
Internal Medicine
7373 WEST LANE
Stockton, CA 95210
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1548343510 (209) 476-2000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

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

MR. DOUGLAS FRANK LARSON PH.D.
Perfusionist
1501 N CAMPBELL AVE, SUITE 4402 ARIZONA HEALTH SCIENCE CENTER
TUCSON, AZ 85724
Pima County (520) 626-6339
MARTIN DEMANT
Pediatrics
1501 N CAMPBELL AVE
TUCSON, AZ 85724
Pima County (520) 626-6507
STEPHANIE RUNKE MD
Obstetrics & Gynecology
1501 N CAMPBELL AVE
TUCSON, AZ 85724
Pima County (520) 694-2530
ASHLEY AZIZI ASSADI MD
Pediatrics
1501 N CAMPBELL AVE
TUCSON, AZ 85724
Pima County (520) 626-7944
STUART HAMEROFF MD
Anesthesiology
1501 N CAMPBELL AVE
TUCSON, AZ 85724
Pima County (520) 694-8888
JOHN GUISTO MD
Emergency Medicine
1501 N CAMPBELL AVE
TUCSON, AZ 85724
Pima County (520) 874-3500
BALDASSARRE STEA MD, PHD
Radiology (Radiation Oncology)
1501 N CAMPBELL AVE
TUCSON, AZ 85724
Pima County (520) 694-7236
NAOMI E RANCE MD, PHD
Pathology (Neuropathology)
1501 N CAMPBELL AVE
TUCSON, AZ 85724
Pima County (520) 874-7400

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 Maria Massey's NPI number?

The NPI number for Maria Massey is 1518544188. It was assigned to this individual provider in the NPPES registry on March 28, 2021. The provider is also known as Dr. Maria Alejandra Alvarado.

Where is Maria Massey located?

Maria Massey practices at 1501 N Campbell Ave, Tucson, AZ 85724. The listed phone number is (520) 626-7141.

What is Maria Massey's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Maria Massey enrolled in Medicare?

Yes. Maria Massey is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Maria Massey's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Maria Massey reassigns Medicare benefits to 2 organizations: Banner-University Medical Group (Tucson, AZ) and Permanente Medical Group Inc (Stockton, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Maria Massey's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Maria Massey accept?

Health plans from Oscar Health Plan, Inc. list Maria Massey as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Maria Massey was last updated on May 27, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.