Marieliz Alonso Calderon, M.D.
Marieliz Alonso Calderon, M.D. is a Geriatric Psychiatry Physician in Fairfax, VA, registered under NPI 1295990018. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 8221 WILLOW OAKS CORPORATE DR, Fairfax, VA 22031. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 0101270761 | VA | Geriatric Psychiatry Physician primary |
| 268925 | NY | Geriatric Psychiatry Physician |
Licences are recorded in 2 states: VA, NY. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Geriatric Psychiatry
- PAC ID
- 5193949907
Medicare enrolment is recorded as approved under the provider type Practitioner - Geriatric Psychiatry. This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 2 states
This provider holds licences in 2 states: New York and Virginia. The practice address on file is in Fairfax, VA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 0101270761
- Specialty
- Geriatric Psychiatry Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Geriatric Psychiatry covers
Geriatric Psychiatry is a subspecialty with psychiatric expertise in prevention, evaluation, diagnosis and treatment of mental and emotional disorders in the elderly, and improvement of psychiatric care for healthy and ill elderly patients. NUCC Health Care Provider Taxonomy, code 2084P0805X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2084P0805X | Geriatric Psychiatry Physician Geriatric Psychiatry | 0101270761 | VA | primary |
| 2084P0805X | Geriatric Psychiatry Physician Geriatric Psychiatry | 268925 | NY |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1295990018 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 21, 2008 |
| Last updated | Mar 11, 2024 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | M.D. |
| Practice address |
8221 WILLOW OAKS CORPORATE DR Fairfax, VA 22031 (703) 289-7599 |
| Mailing address |
PO BOX 37174 Baltimore, MD 21297 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 2 | 9 | 5 | 9 | 9 | 0 | 0 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 9 | 5 | 9 | 9 | 0 | 0 | 2 |
Sum = 62 · next multiple of 10 = 70 · check digit = 8 · actual last digit = 8
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.