Maria Mercado, M.D.
Maria Mercado, M.D. is an Endocrinology, Diabetes & Metabolism Physician in Chula Vista, CA, registered under NPI 1851335723.
Getting there
The practice address on file is 880 3RD AVE, Chula Vista, CA 91911. 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 |
|---|---|---|
| 202331 | CA | Endocrinology, Diabetes & Metabolism… primary |
| 0430844 | KS | Endocrinology, Diabetes & Metabolism… |
| MD60287498 | WA | Endocrinology, Diabetes & Metabolism… |
| 2004022179 | MO | Endocrinology, Diabetes & Metabolism… |
Licences are recorded in 4 states: CA, KS, WA, MO. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Endocrinology
- PAC ID
- 7012997422
- Enrollment ID
- I20121127000147
Medicare enrolment is recorded as approved under the provider type Practitioner - Endocrinology. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 4 states
This provider holds licences in 4 states: California, Kansas, Missouri and Washington. The practice address on file is in Chula Vista, CA, 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
- 202331
- Specialty
- Endocrinology, Diabetes & Metabolism…
- Licence
- 2004022179
- Specialty
- Endocrinology, Diabetes & Metabolism…
- Licence
- MD60287498
- Specialty
- Endocrinology, Diabetes & Metabolism…
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 Endocrinology, Diabetes & Metabolism covers
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems. NUCC Health Care Provider Taxonomy, code 207RE0101X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RE0101X | Endocrinology, Diabetes & Metabolism Physician Endocrinology, Diabetes & Metabolism | 202331 | CA | primary |
| 207RE0101X | Endocrinology, Diabetes & Metabolism Physician Endocrinology, Diabetes & Metabolism | 0430844 | KS | |
| 207RE0101X | Endocrinology, Diabetes & Metabolism Physician Endocrinology, Diabetes & Metabolism | MD60287498 | WA | |
| 207RE0101X | Endocrinology, Diabetes & Metabolism Physician Endocrinology, Diabetes & Metabolism | 2004022179 | MO |
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 | 1851335723 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 15, 2006 |
| Last updated | May 25, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
880 3RD AVE Chula Vista, CA 91911 (619) 205-4585 |
| Mailing address |
MS 315010 PO BOX 3947 Seattle, WA 98124 |
| Other identifiers |
207225004
· Medicaid (MO) 200357540A · Medicaid (KS) 2022404 · Medicaid (WA) |
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 | 8 | 5 | 1 | 3 | 3 | 5 | 7 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 1 | 1 | 6 | 3 | 1 | 7 | 4 |
Sum = 57 · next multiple of 10 = 60 · check digit = 3 · actual last digit = 3
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.