Alexander Castellanos, MD
NPI 1770771511 · Family Medicine Physician · Templeton, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Castellanos, MD is a Family Medicine Physician provider in Templeton, CA (NPI 1770771511).
Provider details
- NPI number
- 1770771511
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G37303 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
3,405 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,219 | $127 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 534 | $179 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 349 | $15 |
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 247 | $7 |
| Complete Ultrasound Study of Arm and Leg Arteries93923 | 126 | $135 |
| Test to Measure Expiratory Airflow and Volume Changes Before and After Medication Administration94060 | 123 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 306 | 85 |
| Losartan Potassium | 197 | 54 |
| Pravastatin Sodium | 153 | 45 |
| Verapamil Hclbrand: Verapamil Er | 141 | 44 |
| Estradiol | 117 | 32 |
| Amlodipine Besylate | 84 | 27 |
| Prednisone | 68 | 31 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-10-05
- Last updated
- 2007-12-26
Frequently asked questions
- What is Alexander Castellanos's NPI number?
- Alexander Castellanos's National Provider Identifier (NPI) is 1770771511, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Castellanos's specialty?
- Alexander Castellanos is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander Castellanos located?
- Alexander Castellanos's practice location on file with NPPES is 699 S Main St, Templeton, CA 93465-5103.
- What is Alexander Castellanos's phone number?
- The practice phone number listed in the NPPES registry for Alexander Castellanos is (805) 434-1804.
- Does Alexander Castellanos accept Medicare?
- Alexander Castellanos is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Castellanos's NPI active?
- Yes — Alexander Castellanos's NPI (1770771511) is active in the NPPES registry as of the last update on 2007-12-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.