Charmaine Diaz, MSN APRN FNP-BC - Medicare Nurse Practitioner in Fairfield, CT

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Charmaine Diaz, MSN APRN FNP-BC is a medicare enrolled "Nurse Practitioner - Family" in Fairfield, Connecticut. She graduated from nursing school in 2025 and has 1 years of diverse experience with area of expertise as Nurse Practitioner. Her current practice location is 425 Post Rd, Fairfield, Connecticut. You can reach out to her office (for appointments etc.) via phone at (203) 254-2021.

Charmaine Diaz is licensed to practice in Connecticut (license number 16726) and she also participates in the medicare program. She may accept medicare assignments (which means she may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance) and her NPI Number is 1306774021.

Contact Information

Charmaine Diaz, MSN APRN FNP-BC
425 Post Rd,
Fairfield, CT 06824-6232
(203) 254-2021
(302) 254-2022

Map and Direction




Provider's Profile

Full NameCharmaine Diaz
GenderFemale
SpecialityNurse Practitioner
Experience1 Years
Location425 Post Rd, Fairfield, Connecticut
Accepts Medicare AssignmentsMay be. She may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Charmaine Diaz graduated from nursing school in 2025
  NPI Data:
  • NPI Number: 1306774021
  • Provider Enumeration Date: 05/12/2026
  • Last Update Date: 06/04/2026
  Medicare PECOS Information:
  • PECOS PAC ID: 5698247211
  • Enrollment ID: I20260615004186

Medical Identifiers

Medical identifiers for Charmaine Diaz such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1306774021NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
363LF0000XNurse Practitioner - Family 16726 (Connecticut)Primary

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Charmaine Diaz allows following entities to bill medicare on her behalf.
Entity NameHartford Healthcare Medical Group Specialists PLLC
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023584216
PECOS PAC ID: 3173866241
Enrollment ID: O20190514001441

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Charmaine Diaz is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Charmaine Diaz, MSN APRN FNP-BC
425 Post Rd,
Fairfield, CT 06824-6232

Ph: (203) 254-2021		Charmaine Diaz, MSN APRN FNP-BC
425 Post Rd,
Fairfield, CT 06824-6232

Ph: (203) 254-2021

Reviews and Comments


Nurse Practitioner Nurses in Fairfield, CT

Judith Karen Adelstein, APRN
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Ms. Anne Madeleine Hyde, MSN, APRN, FNP-BC
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Phone: 203-502-1404    Fax: 203-502-1404
Aneta Rafalo, APRN
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Dr. Lisa Marie Burton, PHD,ARNP, PMHCNS
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Phone: 786-300-5776    
Raquel Olivia Campbell, APRN, PMHNP-BC
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Practice Location: 425 Kings Hwy E Fl 2, Fairfield, CT 06825
Phone: 203-267-0012    Fax: 475-344-6900
Elizabeth T Kamlani, APRN
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Practice Location: 575 Winnepoge Dr, Fairfield, CT 06825
Phone: 203-763-9452    
Maureen Kiernan, APRN
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Practice Location: 40 Timber Ln, Fairfield, CT 06824
Phone: 203-247-5576    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.