Provider Profile
Clarissa A. Castillo, PA
Unclaimed ProfileAbout Clarissa Castillo
Clarissa A. Castillo, PA is a physician assistant practicing in San Ysidro, CA. According to Medicare claims data, Clarissa cared for 135 Medicare patients across 176 services. The services billed most often include insertion of needle into vein for collection of blood sample, sarscov2 vac 50 mcg/0.5ml im, and hemoglobin a1c level.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (619) 662-4100
- Email not available
Practice Locations
4004 BEYER BLVD
San Ysidro, CA 92173
Procedures Most Often Billed to Medicare
176 services · 135 patients · 5 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
105 | More often than most peers in Physician Assistant |
| Sarscov2 vac 50 mcg/0.5ml im | Treatment | 91322 |
21 | More often than most peers in Physician Assistant |
| Admn sarscov2 vacc 1 dose | Treatment | 90480 |
18 | As often as other peers in Physician Assistant |
| Hemoglobin a1c level | Lab test | 83036 |
21 | Less often than most peers in Physician Assistant |
| Urinalysis, manual test | Lab test | 81002 |
11 | Less often than most peers in Physician Assistant |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other physician assistants at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 30 related providers in 4 groups
Other physician assistants in San Ysidro 6
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2005 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Clarissa A. Castillo specialize in?
Clarissa A. Castillo is a physician assistant in San Ysidro, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Clarissa A. Castillo located?
Clarissa A. Castillo is listed at 4004 Beyer Blvd, San Ysidro, CA 92173. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Clarissa A. Castillo's phone number?
The number on file is (619) 662-4100. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Clarissa A. Castillo's NPI number?
Clarissa A. Castillo's National Provider Identifier is 1871506378. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Clarissa A. Castillo train?
Clarissa A. Castillo attended Other, graduating in 2005. This comes from the CMS National Downloadable File.
CMS public data
How long has Clarissa A. Castillo been practicing?
Clarissa A. Castillo has 21 years experience. Calculated from a graduation year of 2005, reported in the CMS National Downloadable File.
CMS public data
What does Clarissa A. Castillo do most often?
According to Medicare billing data, Clarissa A. Castillo performs procedures including insertion of needle into vein for collection of blood sample; provides treatments such as sarscov2 vac 50 mcg/0.5ml im and admn sarscov2 vacc 1 dose, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Clarissa A. Castillo confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Clarissa A. Castillo. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.