Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

MS. Mary Elizabeth Massieu, DNP, FNP-C

Individual provider Family Nurse Practitioner · NPI 1144644287

MS. Mary Elizabeth Massieu, DNP, FNP-C is a Nurse Practitioner in Dewey, Arizona. Qualified in 2006, 20 years ago. Practices with Carelock LLC, a 14-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Arizona and Florida.

Years since qualifying
20
Licensed in
AZ, FL
In the registry since
2014
Specialties on file
2
What do these letters mean?
DNP — Doctor of Nursing Practice
The highest clinical degree in nursing.
FNP-C — Family Nurse Practitioner, Certified
A family nurse practitioner certified by the AANP.

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Practice location Address checks out

12075 E State Route 69
Dewey, AZ 86327-4517
Phone: (928) 777-9600
Fax: (602) 218-4443
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence 226377 (AZ)
Family Nurse Practitioner Taxonomy 363LF0000X · Licence ARNP2936392 (FL)

Record details

NPI number1144644287
Entity typeIndividual (Type 1)
GenderFemale
Credentials DNP , FNP-C
Sole proprietorNo
NPI enumeratedFebruary 10, 2014
Last updated in NPPESOctober 19, 2024
Certification dateOctober 19, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2006 (20 years in practice)
Group practice Carelock Llc — 14 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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