Althea Marie Fernandez Diaz, MD is a medicare enrolled "Allergy & Immunology" physician in Brewster, New York. She went to New York Medical College and graduated in 2019 and has 7 years of diverse experience with area of expertise as Allergy/immunology. She is a member of the group practice Optum Medical Care Pc and her current practice location is
185 Ny 312 Southeast Executive Park, Brewster, New York. You can reach out to her office (for appointments etc.) via phone at
(845) 278-7000.
Althea Marie Fernandez Diaz is licensed to practice in New York (license number 316128) and she also participates in the medicare program. She
accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1649838640.
Physician's Profile
| Full Name | Althea Marie Fernandez Diaz |
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| Gender | Female |
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| Speciality | Allergy/immunology |
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| Experience | 7 Years |
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| Location | 185 Ny 312 Southeast Executive Park, Brewster, New York |
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| Accepts Medicare Assignments | Yes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance. |
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Medical Education and Training:
- Althea Marie Fernandez Diaz attended and graduated from New York Medical College in 2019
NPI Data:
- NPI Number: 1649838640
- Provider Enumeration Date: 06/04/2019
- Last Update Date: 07/16/2025
Medicare PECOS Information:
- PECOS PAC ID: 3577001874
- Enrollment ID: I20240819000537
Medical Identifiers
Medical identifiers for Althea Marie Fernandez Diaz such as npi, medicare ID, medicare PIN, medicaid, etc.
| Identifier | Type | State | Issuer |
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| 1649838640 | NPI | - | NPPES |
Medical Taxonomies and Licenses
| Taxonomy | Type | License (State) | Status |
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| 207R00000X | Internal Medicine | 316128 (New York) | Secondary |
| 207K00000X | Allergy & Immunology | 316128 (New York) | Primary |
Group Practice Association
| Group Practice Name | Group PECOS PAC ID | No. of Members |
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| Optum Medical Care Pc | 9931013240 | 979 |
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. Althea Marie Fernandez Diaz allows following entities to bill medicare on her behalf.
| Entity Name | Optum Medical Care Pc |
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| Entity Type | Part B Supplier - Clinic/group Practice |
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| Entity Identifiers | NPI Number: 1982643003
PECOS PAC ID: 9931013240
Enrollment ID: O20031119000321 |
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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. Althea Marie Fernandez 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 Address | Practice Location Address |
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Althea Marie Fernandez Diaz, MD
240 Weyman Ave,
New Rochelle, NY 10805-1423
Ph: (914) 602-1758 | Althea Marie Fernandez Diaz, MD
185 Ny 312 Southeast Executive Park,
Brewster, NY 10509
Ph: (845) 278-7000 |
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