Dr. Jason A. Portillo, MD
- Medicare patients, 2024
- 21
- Part D claims, 2024
- 426
- Hospital affiliations
- 3
- Medical group
- 1
- State license
- 1
- Practice address
- 360 Rush Dr, San Marcos, CA 92078
- Practice phone
- Call (760) 528-6295
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Portillo'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. Jason A. Portillo is a hospitalist in San Marcos, California
Dr. Portillo practices at Kaiser Permanente San Marcos Medical Center in San Marcos, California, part of Kaiser Permanente.
Dr. Portillo's NPI, 1427329176, was assigned on January 25, 2012. Dr. Portillo graduated from University of Southern California Keck School of Medicine in 2011. Dr. Portillo holds California license A125714.
- NPI
- 1427329176NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1355665597
- NPI enumeration date
- January 25, 2012
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (760) 528-6295
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jason A. Portillo practices at Kaiser Permanente San Marcos Medical Center in San Marcos, California
Dr. Portillo's primary practice is Kaiser Permanente San Marcos Medical Center, at 360 Rush Dr, San Marcos, CA 92078 in San Diego County. The practice phone is (760) 528-6295.
- Kaiser Permanente San Marcos Medical Center360 Rush Dr, San Marcos, CA 92078 · San Diego CountyPhone(760) 528-6295
Source: Dmand AI Affiliation Data
Dr. Jason A. Portillo is affiliated with 3 sites of care and 1 medical group
Dr. Portillo's primary practice is Kaiser Permanente San Marcos Medical Center in San Marcos, California, part of Kaiser Permanente. Dr. Portillo is also affiliated with Kaiser Permanente Zion Medical Center. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Portillo to 1 more hospital, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jason A. Portillo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Portillo practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente San Marcos Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jason A. Portillo is one of 3,186 hospitalists in California
Hospitalist is Dr. Portillo's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Portillo is licensed in California.
Specialties and state licenses
- Hospitalist, CaliforniaPrimary
Hospitalists near Dr. Portillo
Counts of hospitalists 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
Dr. Jason A. Portillo treated 21 Medicare patients in 2024, average age 65
CMS counts 21 Medicare patients who saw Dr. Portillo in 2024. 75% of them have high blood pressure, and 67% have high cholesterol. Their average risk score is 3.50, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Portillo's median patient age at 72, with 55% women.
Chronic conditions among Dr. Portillo's Medicare patients, 2024
- High blood pressure75%
- High cholesterol67%
- Mood disorders67%
- Depression57%
- Chronic kidney disease52%
- Diabetes52%
Share of Medicare patients with each condition. A patient can have several.
Dr. Portillo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jason A. Portillo wrote 426 Medicare Part D claims in 2024
In 2024, Dr. Portillo wrote 426 Medicare Part D claims for 155 patients. 84% of them were for generic drugs. CMS names the drug for 159 of them, across 11 drugs with 11 or more claims each, at $21,644 in total drug cost. In 2023, CMS named 57 claims across 4 drugs.
Dr. Portillo's Part D claims by kind of drug, 2024
- Generic359 claims84%
- Brand-name and other67 claims16%
Dr. Portillo's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Portillo's Part D claims, 2024
- Opioids7%30 of 426 claims
- Antibiotics18%75 of 426 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 572024: 159179%
Drugs named by CMS: 11 in 2024, 4 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Jason A. Portillo takes part in Medicare
Dr. Portillo accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Jason A. Portillo graduated from University of Southern California Keck School of Medicine
Dr. Portillo graduated from University of Southern California Keck School of Medicine in 2011.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Jason A. Portillo'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 | Dmand AI Affiliation 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Jason A. Portillo
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. Jason A. Portillo's NPI number?
Dr. Jason A. Portillo's NPI number is 1427329176. It was assigned on January 25, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. Jason A. Portillo?
Dr. Jason A. Portillo is a hospitalist in San Marcos, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Jason A. Portillo practice?
Dr. Portillo practices at 360 Rush Dr, San Marcos, CA 92078. Dr. Portillo's primary practice is Kaiser Permanente San Marcos Medical Center in San Marcos, California, part of Kaiser Permanente. Dmand AI also links Dr. Portillo to 1 hospital.
What is Dr. Jason A. Portillo's office phone number?
The practice phone on file for Dr. Portillo is (760) 528-6295.
What is Dr. Jason A. Portillo's medical license number?
Dr. Portillo holds California license A125714.
Which hospitals is Dr. Jason A. Portillo affiliated with?
Dr. Portillo practices at Kaiser Permanente San Marcos Medical Center in San Marcos, California. Dr. Portillo is also affiliated with Kaiser Permanente Zion Medical Center. Dmand AI links Dr. Portillo to 1 more hospital.
What medical group is Dr. Jason A. Portillo part of?
Dr. Portillo is linked to Southern California Permanente Medical Group.
Does Dr. Jason A. Portillo accept Medicare?
Yes. CMS lists Dr. Portillo as accepting Medicare assignment.
How many Medicare patients does Dr. Jason A. Portillo see?
CMS counts 21 Medicare patients who saw Dr. Portillo in 2024, with an average age of 65.
Where did Dr. Jason A. Portillo go to medical school?
Dr. Portillo graduated from University of Southern California Keck School of Medicine in 2011.
What drugs does Dr. Jason A. Portillo prescribe most?
In 2024 Medicare Part D data, Dr. Portillo's most prescribed drugs by claims were Furosemide, Cefpodoxime Proxetil and Naloxone HCl.
How long has Dr. Jason A. Portillo been practicing?
Dr. Portillo graduated from medical school in 2011, 15 years ago.
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