MARIELIZ VERONICA ALONSO CALDERON M.D.
NPI 1295990018
Psychiatry & Neurology - Geriatric Psychiatry in Fairfax, VA
About Marieliz Veronica Alonso Calderon M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIELIZ VERONICA ALONSO CALDERON M.D. (NPI 1295990018) is an individual geriatric psychiatry provider in Fairfax, Virginia, licensed in Virginia (0101270761) and active in the NPI registry since July 2008. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of New York Medical College (2008).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Accepted 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
Marieliz Veronica Alonso Calderon M.d. 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.
Medicare Billing Reassignments
2Medicare enrollment records show Marieliz Alonso Calderon reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Falls Church, VA 22042
- Reassigned Medicare billing, District of Columbia and Virginia enrollments
- Also billed through NPI 1588717755 (Virginia)
- 282 clinicians in this Medicare group
Bronx, NY 10451
- Reassigned Medicare billing, New York enrollment
- 971 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 22031 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
FAIRFAX, VA 22031
FAIRFAX, VA 22031
FAIRFAX, VA 22031
FAIRFAX, VA 22031
FAIRFAX, VA 22031
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 Marieliz Alonso Calderon's NPI number?
The NPI number for Marieliz Alonso Calderon is 1295990018. It was assigned to this individual provider in the NPPES registry on July 21, 2008.
Where is Marieliz Alonso Calderon located?
Marieliz Alonso Calderon practices at 8221 Willow Oaks Corporate Dr, Fairfax, VA 22031. The listed phone number is (703) 289-7599.
What is Marieliz Alonso Calderon's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Geriatric Psychiatry, with taxonomy code 2084P0805X.
Is Marieliz Alonso Calderon enrolled in Medicare?
Yes. Marieliz Alonso Calderon 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 Marieliz Alonso Calderon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marieliz Alonso Calderon reassigns Medicare benefits to 2 organizations: Inova Health Care Services (Falls Church, VA) and Downtown Bronx Medical Associates PC (Bronx, NY). 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 Marieliz Alonso Calderon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marieliz Alonso Calderon accept?
Health plans from Oscar Health list Marieliz Alonso Calderon 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 Marieliz Alonso Calderon was last updated on March 11, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.
# Marieliz Veronica Alonso Calderon, M.D. · NPI 1295990018
Geriatric Psychiatry physician in Fairfax, Virginia. Individual provider, active in the CMS NPPES registry since July 21, 2008.
## Identity
- **NPI:** 1295990018 (Entity type: Individual)
- **Enumerated:** July 21, 2008
- **Primary specialty:** Psychiatry & Neurology - Geriatric Psychiatry · taxonomy 2084P0805X
- **State license:** 0101270761 (Virginia)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 8221 WILLOW OAKS CORPORATE DR, Fairfax, VA 22031-4512
- **Phone:** (703) 289-7599
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Inova Health Care Services (NPI 1952320061, Falls Church, VA); Downtown Bronx Medical Associates PC (NPI 1689618407, Bronx, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York Medical College, class of 2008
## Record status
- **NPPES last updated:** March 11, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1295990018) · Data from the CMS NPPES public registry.