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Dr. Guillermo Diaz Jr., MD
NPI1134161144
- Publications
- 2
- Hospital affiliations
- 1
- Medical group
- 1
- Insurance carriers
- 2
- State license
- 1
- Practice address
- 2051 Marengo St, Room C2K100, Los Angeles, CA 90033
- Practice phone
- Call (323) 226-2800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Diaz'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.
Dr. Guillermo Diaz Jr. is a pediatrician in Los Angeles, California
Dr. Diaz practices at Los Angeles General Medical Center in Los Angeles, California, part of County of Los Angeles.
Dr. Diaz's NPI, 1134161144, was assigned on June 12, 2006. Dr. Diaz graduated from David Geffen School of Medicine at UCLA in 2002. Dr. Diaz's California license number on file is A86465.
NPI and contact details
- NPI
- 1134161144NPI Registry (opens in a new tab)
- NPI enumeration date
- June 12, 2006
- NPI status
- Active
- Practice phone
- (323) 226-2800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Guillermo Diaz Jr. practices at 2 locations in Los Angeles, California
Dr. Diaz's primary practice is Los Angeles General Medical Center, at 2051 Marengo St, Room C2K100, Los Angeles, CA 90033 in Los Angeles County. The practice phone is (323) 226-2800. Dr. Diaz also practices at LAC-USC Medical Center, 2829 S Grand Ave, Los Angeles, CA 90007.
- Los Angeles General Medical CenterPrimary2051 Marengo St, Room C2K100, Los Angeles, CA 90033 · Los Angeles CountyPhone(323) 226-2800
- LAC-USC Medical Center2829 S Grand Ave, Los Angeles, CA 90007 · Los Angeles CountyPhone(213) 744-3945
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Guillermo Diaz Jr. is affiliated with 2 sites of care and 1 medical group
Dr. Diaz's primary practice is Los Angeles General Medical Center in Los Angeles, California, part of County of Los Angeles. The medical group on file is Harbor-UCLA Medical Center. Dmand AI also links Dr. Diaz to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Guillermo Diaz Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diaz practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Los Angeles General Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Guillermo Diaz Jr. is one of 8,236 pediatricians in California
Pediatrics is Dr. Diaz's primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. Diaz is board certified in pediatrics by the American Board of Pediatrics. Dr. Diaz has a license on file in California.
Specialties and state licenses
- Pediatrics, CaliforniaPrimary
Pediatricians near Dr. Diaz
Counts of pediatricians with a Dmand AI profile, by place and practice. Each opens the list.
8,236pediatricians in California690pediatricians in Los Angeles42pediatricians at Los Angeles General Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Guillermo Diaz Jr.'s patients have a median age of 17
Across all payers, Dmand AI patient panel data puts Dr. Diaz's median patient age at 17, with 15% women.
Dr. Diaz's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 17
Patient panel by sex, all payers
- Women15%
- Men85%
Source: Dmand AI Patient Panel Data
Dr. Guillermo Diaz Jr. has 2 publications on record
Dmand AI links 2 papers to Dr. Diaz in 2012. Dr. Diaz's most frequent co-authors are Mark William Friedberg, MD, Jeffrey A. Linder, FACP, MD, MPH and Alan F. Rothfeld, MD.
Papers2
Dr. Diaz's most frequent co-authors
- Mark William Friedberg, MD1 shared paper
- Jeffrey A. Linder, FACP, MD, MPH1 shared paper
- Alan F. Rothfeld, MD1 shared paper
Recent publications by Dr. Diaz
See who Dr. Diaz researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Diaz works with, so you can find a warm path to the right pediatricians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Guillermo Diaz Jr. graduated from David Geffen School of Medicine at UCLA
Dr. Diaz graduated from David Geffen School of Medicine at UCLA in 2002.
- Medical school
- Board certified in pediatrics
- Board certified in clinical informatics
Source: Dmand AI Professional Profile Data
Dr. Guillermo Diaz Jr. accepts plans from 2 insurance carriers
Dr. Diaz is in network with 2 carriers, including Elevance and LA Care. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Elevance
- LA Care
Plan types Dr. Diaz accepts, by number of carriers
- HMO2
- EPO1
- Medicaid1
- Medicare1
- POS1
- PPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Guillermo Diaz Jr.'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 Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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 Dr. Guillermo Diaz Jr.
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Guillermo Diaz Jr.'s NPI number?
Dr. Guillermo Diaz Jr.'s NPI number is 1134161144. It was assigned on June 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Guillermo Diaz Jr.?
Dr. Guillermo Diaz Jr. is a pediatrician in Los Angeles, California. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. Guillermo Diaz Jr. practice?
Dr. Diaz practices at 2051 Marengo St, Room C2K100, Los Angeles, CA 90033. Dr. Diaz also practices at 2829 S Grand Ave, Los Angeles, CA 90007. Dr. Diaz's primary practice is Los Angeles General Medical Center in Los Angeles, California, part of County of Los Angeles. Dmand AI also links Dr. Diaz to 1 group practice or clinic.
What is Dr. Guillermo Diaz Jr.'s office phone number?
The practice phone on file for Dr. Diaz is (323) 226-2800.
What is Dr. Guillermo Diaz Jr.'s medical license number?
Dr. Diaz's California license number on file is A86465.
Which hospitals is Dr. Guillermo Diaz Jr. affiliated with?
Dr. Diaz practices at Los Angeles General Medical Center in Los Angeles, California.
What medical group is Dr. Guillermo Diaz Jr. part of?
Dr. Diaz is linked to Harbor-UCLA Medical Center.
Is Dr. Guillermo Diaz Jr. board certified?
Yes. Dr. Diaz is board certified in pediatrics by the American Board of Pediatrics.
Where did Dr. Guillermo Diaz Jr. go to medical school?
Dr. Diaz graduated from David Geffen School of Medicine at UCLA in 2002.
How long has Dr. Guillermo Diaz Jr. been practicing?
Dr. Diaz graduated from medical school in 2002, 24 years ago.
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Does Dr. Guillermo Diaz Jr. do research?
Dmand AI links 2 publications to Dr. Diaz.
Who does Dr. Guillermo Diaz Jr. publish with?
Dr. Diaz's most frequent co-authors are Mark William Friedberg, MD (1 shared paper), Jeffrey A. Linder, FACP, MD, MPH (1 shared paper) and Alan F. Rothfeld, MD (1 shared paper).
What insurance does Dr. Guillermo Diaz Jr. accept?
Dr. Diaz is in network with 2 carriers, including Elevance and LA Care. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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