Monica Guillen
- Hospital affiliations
- 1
- Industry payments
- $23
- Medical group
- 1
- State license
- 1
- Year NPI issued
- 2021
- Practice address
- 8403 N Fallbrook Ave, West Hills, CA 91304
- Practice phone
- Call (800) 877-2515
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Quest Diagnostics
West Hills, California
Find Monica Guillen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Monica Guillen is a physician assistant in West Hills, California
Monica Guillen practices at Quest Diagnostics in West Hills, California.
Monica Guillen's NPI, 1801480546, was assigned on February 23, 2021. Monica Guillen holds California license 66659.
- NPI
- 1801480546NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638676174
- NPI enumeration date
- February 23, 2021
- NPI status
- Active
- Practice phone
- (800) 877-2515
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 28
- Medical school graduation
- 2024
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Monica Guillen practices at Quest Diagnostics in West Hills, California
Monica Guillen's primary practice is Quest Diagnostics, at 8403 N Fallbrook Ave, West Hills, CA 91304 in Los Angeles County. The practice phone is (800) 877-2515.
- Quest Diagnostics8403 N Fallbrook Ave, West Hills, CA 91304 · Los Angeles CountyPhone(800) 877-2515
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Monica Guillen is affiliated with 2 sites of care and 1 medical group
Monica Guillen's primary practice is Quest Diagnostics in West Hills, California. Monica Guillen is also affiliated with Memorial Hospital Los Banos. The medical group on file is Camarena Health.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Monica Guillen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Monica Guillen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Quest Diagnostics | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Monica Guillen is one of 11,482 physician assistants in California
Physician assistant is Monica Guillen's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Monica Guillen is licensed in California.
Specialties and state licenses
- Physician assistant, CaliforniaPrimary
Physician assistants near Monica Guillen
Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Monica Guillen's patients have a median age of 38
Across all payers, Dmand AI patient panel data puts Monica Guillen's median patient age at 38, with 78% women.
Monica Guillen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 38
Patient panel by sex, all payers
- Women78%
- Men22%
Source: Dmand AI Patient Panel Data
Monica Guillen received $23 in industry payments in 2025
CMS Open Payments shows 1 general payment to Monica Guillen from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Organon LLC paid the most, $23.
Companies that paid Monica Guillen the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Monica Guillen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Monica Guillen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Monica Guillen's NPI number?
Monica Guillen's NPI number is 1801480546. It was assigned on February 23, 2021, and it is active in the NPI Registry.
What does Monica Guillen specialize in?
Monica Guillen is a physician assistant in West Hills, California. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Monica Guillen practice?
Monica Guillen practices at 8403 N Fallbrook Ave, West Hills, CA 91304. Monica Guillen's primary practice is Quest Diagnostics in West Hills, California.
What is Monica Guillen's office phone number?
The practice phone on file for Monica Guillen is (800) 877-2515.
What is Monica Guillen's medical license number?
Monica Guillen holds California license 66659.
Which hospitals is Monica Guillen affiliated with?
Monica Guillen is affiliated with Memorial Hospital Los Banos.
What medical group is Monica Guillen part of?
Monica Guillen is linked to Camarena Health.
Has Monica Guillen received payments from drug or device companies?
CMS Open Payments shows $23 in general payments to Monica Guillen from 1 company from 2025 to 2025. The largest total came from Organon LLC.
How long has Monica Guillen been practicing?
Monica Guillen graduated from medical school in 2024, 2 years ago.
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