Mary Elizabeth Massieu, DNP, FNP -C
Family Nurse Practitioner · Dewey, AZ
Mary Elizabeth Massieu, DNP, FNP -C is a family nurse practitioner with a practice address in Dewey, Arizona, and NPI 1144644287, issued on Feb 10, 2014. Check the license (Arizona 226377, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Elizabeth Massieu
- Credential
- DNP, FNP -C
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License numbers
- 226377 AZ
ARNP2936392 FL
Self-reported in NPPES; status is on the state search - Practice location
- 12075 E State Route 69, Dewey, AZ 86327
- Phone
- (928) 777-9600
- Enumerated
- Feb 10, 2014
- Record last updated
- Oct 19, 2024
- Fax
- (602) 218-4443
- Medicare enrollment
- Enrolled (PECOS I20210311003043); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 5,933 in Arizona → Look up another NPI →
Also registered at 12075 E State Route 69
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Danielle Durnan, FNP-CFamily Nurse Practitioner1306181656
Verify Mary Elizabeth Massieu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Arizona board licenses this profession
Search for license 226377Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.5 times the Medicare Part D claims of the average family nurse practitioner in 2024
4,534 Medicare Part D claims for 690 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 434 claims were for opioids.
Most prescribed
- Atorvastatin Calcium170 claims
- Albuterol Sulfate Hfa167 claims
- Lisinopril154 claims
- Gabapentin145 claims
- Hydrocodone-Acetaminophen143 claims
- Levothyroxine Sodium124 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: $699.37
25 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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
- Carelock LLCChino Valley, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Elizabeth Massieu among 5,933 family nurse practitioner records in Arizona
Mary Elizabeth Massieu, DNP, FNP -C 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 2014, is newer than 27% of them.
- NPI issued2014 · 27% of these records are older, 69% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2006 · median 2019 among the 3,510 with a school on file
- Record last updated2024 · 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).
6 family nurse practitioner records list a practice address in Dewey
They are 6 of the 51 NPPES records with a practice address in Dewey, and 5,933 family nurse practitioner records in Arizona.
All 5,933 in Arizona → Every provider in Dewey → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Tanner Davis, DNPDewey, AZ 863271962201491
- Danielle Durnan, FNP-CDewey, AZ 863271306181656
- Linda Nelson, FNPPrescott Valley, AZ 863271013291707
- Frederic Ondovchak, R.N., M.S.N., A.P.R.Dewey, AZ 863271932503802
- Lindsey Robbins, FNP-CDewey, AZ 863271104285253
- Vanessa Scheu, NP-C, MSNDewey, AZ 863271093218877
- Shelley Candelaria, FNP-BCCottonwood, AZ 863261447032321
- Mindy Diehl, FNP-CCottonwood, AZ 863261174270193
Common questions
What is Mary Elizabeth Massieu, DNP, FNP -C's NPI number?
Mary Elizabeth Massieu, DNP, FNP -C's National Provider Identifier (NPI) is 1144644287, issued on Feb 10, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Mary Elizabeth Massieu, DNP, FNP -C located?
The NPPES record lists a practice address at 12075 E State Route 69, Dewey, AZ, 86327. Phone: (928) 777-9600. Providers update this record themselves, so call before visiting.
How can I verify Mary Elizabeth Massieu, DNP, FNP -C's license?
NPPES lists Arizona license number 226377, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Elizabeth Massieu, DNP, FNP -C prescribe under Medicare Part D?
In 2024, Mary Elizabeth Massieu, DNP, FNP -C had 4,534 Medicare Part D claims for 690 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.