Doctor profile · Federal record
Dr. Guillermo Perez, P.A.
Physician Assistant · Greenfield, CA
- NPI 1275557506
- 20 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
467 El Camino Real
Greenfield, CA 939274915
(831) 674-0112
fax (831) 674-4199
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- July 8, 2007
- Year of graduation
- 2006 — 20 yrs since
- Specialty taxonomy
- 363A00000X — NUCC code
- State license (1)
- California #PA18456
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1275557506. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
14
Distinct HCPCS
1
Medicare allowed
$1,601
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99203 |
New patient office or other outpatient visit, 30-44 minutes | 14 | 14 | $114 |
In context: peer comparison
Among 1 peers in Greenfield Physician Assistant, average services per provider: 14. This provider delivers 1.0× the peer median.Open Payments
Industry payments received
All-time total
$33
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Boehringer Ingelheim Pharmaceuticals, INC. | 1 | $33.46 |
By nature of payment
Frequently asked questions
What is Dr. Guillermo Perez's medical specialty?
Dr. Guillermo Perez practices Physician Assistant in Greenfield, CA.
Where does Dr. Guillermo Perez practice?
Dr. Guillermo Perez practices at 467 El Camino Real, Greenfield, CA 939274915. Office phone: 8316740112.
What is Dr. Guillermo Perez's NPI?
Dr. Guillermo Perez's National Provider Identifier (NPI) is 1275557506, issued by NPPES.
Does Dr. Guillermo Perez accept Medicare assignment?
Dr. Guillermo Perez does not accept Medicare assignment for all services. Patients may be billed amounts beyond Medicare-allowed charges.
What procedures does Dr. Guillermo Perez commonly perform?
Top Medicare-reported procedures in 2023: New patient office or other outpatient visit (HCPCS 99203). Source: CMS Medicare Physician & Other Practitioners file.