Kerstyn A. O'Brien, PA-C
- Medicare patients, 2024
- 149
- Part D claims, 2024
- 118
- MIPS score, 2024
- 89
- Hospital affiliations
- 1
- Industry payments
- $10
- Practice address
- 11234 Anderson St, Loma Linda, CA 92354
- Practice phone
- Call (909) 558-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Kerstyn O'Brien'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.
Kerstyn A. O'Brien is a physician assistant in Loma Linda, California
Kerstyn O'Brien practices at Loma Linda University Medical Center in Loma Linda, California, part of Seventh-day Adventist Church.
Kerstyn O'Brien's NPI, 1972179992, was assigned on June 1, 2021. Kerstyn O'Brien holds California license 59940.
- NPI
- 1972179992NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8022416528
- NPI enumeration date
- June 1, 2021
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (909) 558-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 31
- Medical school graduation
- 2021
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Kerstyn A. O'Brien practices at Loma Linda University Medical Center in Loma Linda, California
Kerstyn O'Brien's primary practice is Loma Linda University Medical Center, at 11234 Anderson St, Loma Linda, CA 92354 in San Bernardino County. The practice phone is (909) 558-4000.
- Loma Linda University Medical Center11234 Anderson St, Loma Linda, CA 92354 · San Bernardino CountyPhone(909) 558-4000
Source: Dmand AI Affiliation Data
Kerstyn A. O'Brien is affiliated with 1 site of care and 1 medical group
Kerstyn O'Brien's primary practice is Loma Linda University Medical Center in Loma Linda, California, part of Seventh-day Adventist Church. The medical group on file is Loma Linda University Faculty Medical Group (LLUFMG).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Kerstyn A. O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Kerstyn O'Brien practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Loma Linda University Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Seventh-day Adventist Church and 6.2K+ hospitals, with verified contacts in the same login.
Kerstyn A. O'Brien is one of 2,381 physician assistants in California
Medical is Kerstyn O'Brien's primary specialty in the NPI Registry, under taxonomy code 363AM0700X. Kerstyn O'Brien is licensed in California.
Specialties and state licenses
- Medical physician assistant, CaliforniaPrimary
Physician assistants near Kerstyn O'Brien
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
Kerstyn A. O'Brien treated 149 Medicare patients in 2024, average age 71
CMS counts 149 Medicare patients who saw Kerstyn O'Brien in 2024. The largest group is 65 to 74, with 69 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 48% are also on Medicaid. Their average risk score is 2.73, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Kerstyn O'Brien's median patient age at 68, with 47% women.
Kerstyn O'Brien's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Kerstyn O'Brien's Medicare patients by sex, 2024
- Women9161%
- Men5839%
Chronic conditions among Kerstyn O'Brien's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis53%
- COPD49%
- Heart failure44%
- Chronic kidney disease43%
- Diabetes43%
- Cancer36%
Share of Medicare patients with each condition. A patient can have several.
Kerstyn O'Brien's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women47%
- Men52%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Kerstyn A. O'Brien wrote 118 Medicare Part D claims in 2024
In 2024, Kerstyn O'Brien wrote 118 Medicare Part D claims for 36 patients. 46% of them were for generic drugs.
Kerstyn O'Brien's Part D claims by kind of drug, 2024
- Generic54 claims46%
- Brand-name64 claims54%
Drug classes CMS tracks in Kerstyn O'Brien's Part D claims, 2024
- Antibiotics10%12 of 118 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Kerstyn A. O'Brien scored 89 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 89 out of 100 for Kerstyn O'Brien for performance year 2024, reported as part of a group. Kerstyn O'Brien accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Kerstyn O'Brien as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Kerstyn O'Brien's MIPS scores, performance year 2024
- 89of 100Final score
- 72.1of 100Quality
- 80of 100Promoting Interoperability
- 40of 100Improvement Activities
- 77of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Kerstyn A. O'Brien received $10 in industry payments in 2025
CMS Open Payments shows 1 general payment to Kerstyn O'Brien from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Pulmonx Corporation paid the most, $10.
Companies that paid Kerstyn O'Brien 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 Kerstyn A. O'Brien'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 (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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| 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 Kerstyn A. O'Brien
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Kerstyn A. O'Brien's NPI number?
Kerstyn A. O'Brien's NPI number is 1972179992. It was assigned on June 1, 2021, and it is active in the NPI Registry.
What does Kerstyn A. O'Brien specialize in?
Kerstyn A. O'Brien is a physician assistant in Loma Linda, California. The primary specialty in the NPI Registry is Medical Physician Assistant (taxonomy code 363AM0700X).
Where does Kerstyn A. O'Brien practice?
Kerstyn O'Brien practices at 11234 Anderson St, Loma Linda, CA 92354. Kerstyn O'Brien's primary practice is Loma Linda University Medical Center in Loma Linda, California, part of Seventh-day Adventist Church.
What is Kerstyn A. O'Brien's office phone number?
The practice phone on file for Kerstyn O'Brien is (909) 558-4000.
What is Kerstyn A. O'Brien's medical license number?
Kerstyn O'Brien holds California license 59940.
Which hospitals is Kerstyn A. O'Brien affiliated with?
Kerstyn O'Brien practices at Loma Linda University Medical Center in Loma Linda, California.
What medical group is Kerstyn A. O'Brien part of?
Kerstyn O'Brien is linked to Loma Linda University Faculty Medical Group (LLUFMG).
Does Kerstyn A. O'Brien accept Medicare?
Yes. CMS lists Kerstyn O'Brien as accepting Medicare assignment.
Does Kerstyn A. O'Brien offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Kerstyn O'Brien as offering telehealth services.
What is Kerstyn A. O'Brien's MIPS score?
Kerstyn O'Brien's MIPS final score for performance year 2024 is 89 out of 100, reported as part of a group.
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How many Medicare patients does Kerstyn A. O'Brien see?
CMS counts 149 Medicare patients who saw Kerstyn O'Brien in 2024, with an average age of 71.
Has Kerstyn A. O'Brien received payments from drug or device companies?
CMS Open Payments shows $10 in general payments to Kerstyn O'Brien from 1 company from 2025 to 2025. The largest total came from Pulmonx Corporation.
How long has Kerstyn A. O'Brien been practicing?
Kerstyn O'Brien graduated from medical school in 2021, 5 years ago.
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