CaliforniaCOVID-19Patient Acuity
Dr. Patrick J. Merrill, MD
NPI1952460545
- Medicare services, 2017
- 17
- Part D claims, 2024
- 144
- Publications
- 2
- Hospital affiliations
- 1
- Industry payments
- $445
- Practice address
- 10800 Magnolia Avenue, Riverside, CA 92505
- Practice phone
- Call (951) 353-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Merrill'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. Patrick J. Merrill is an internist in Riverside, California
Dr. Merrill practices at Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
Dr. Merrill's NPI, 1952460545, was assigned on December 8, 2006. Dr. Merrill graduated from University of Illinois College of Medicine - Chicago in 1984. Dr. Merrill holds California license G56039.
NPI and contact details
- NPI
- 1952460545NPI Registry (opens in a new tab)
- NPI enumeration date
- December 8, 2006
- NPI status
- Active
- Practice phone
- (951) 353-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Patrick J. Merrill practices at Riverside Medical Center in Riverside, California
Dr. Merrill's primary practice is Riverside Medical Center, at 10800 Magnolia Avenue, Riverside, CA 92505 in Riverside County. The practice phone is (951) 353-2000.
- Riverside Medical Center10800 Magnolia Avenue, Riverside, CA 92505 · Riverside CountyPhone(951) 353-2000
Source: Dmand AI Affiliation Data
Dr. Patrick J. Merrill is affiliated with 1 site of care and 1 medical group
Dr. Merrill's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Patrick J. Merrill's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Merrill practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Riverside Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Patrick J. Merrill is one of 16,751 internists in California
Internal medicine is Dr. Merrill's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Merrill is board certified in internal medicine by the American Board of Internal Medicine. Dr. Merrill is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Merrill
Counts of internists 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. Patrick J. Merrill billed Medicare for 17 services in 2017
CMS data shows 17 Medicare services from Dr. Merrill across 1 procedure code in 2017, all of them office visits. Medicare paid $852 for them. Every service was in an office.
Medicare services, 201717
Paid by Medicare$852
Procedure codes1
Dr. Merrill compared with the California median for internists, 2017
- Dr. Merrill
- California median
- Medicare services
- 17vs 36195% below
- Part D claims
- 125vs 42170% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Merrill's most billed Medicare procedure codes, 2017
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Merrill?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Merrill and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Patrick J. Merrill's patients have a median age of 48
Across all payers, Dmand AI patient panel data puts Dr. Merrill's median patient age at 48, with 85% women.
Dr. Merrill's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 48
Patient panel by sex, all payers
- Women85%
- Men14%
Source: Dmand AI Patient Panel Data
Dr. Patrick J. Merrill wrote 144 Medicare Part D claims in 2024
In 2024, Dr. Merrill wrote 144 Medicare Part D claims for 135 patients. 10% of them were for generic drugs. CMS names the drug for 125 of them, across 2 drugs with 11 or more claims each, at $395 in total drug cost. In 2023, CMS named 233 claims across 1 drug.
Part D claims, 2024144
Drugs named by CMS2
Total drug cost$395
Part D patients135
Dr. Merrill's Part D claims by kind of drug, 2024
- Generic14 claims10%
- Brand-name101 claims70%
- Other29 claims20%
Dr. Merrill'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2332024: 12546%
Drugs named by CMS: 2 in 2024, 1 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
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Dr. Patrick J. Merrill has 2 publications on record
Dmand AI links 2 papers to Dr. Merrill, published from 2021 to 2023. Dr. Merrill's most frequent co-author is Michael Terry Ulrich.
Papers2
Years published2021 to 2023
Dr. Merrill's most frequent co-authors
Recent publications by Dr. Merrill
COVID-19 Drug TreatmentEptifibatidePeptides
See who Dr. Merrill researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Merrill works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Patrick J. Merrill received $445 in industry payments from 2016 to 2019
CMS Open Payments shows 5 general payments to Dr. Merrill from 4 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. Regeneron Pharmaceuticals, Inc. paid the most, $210.
General payments to Dr. Merrill by program year, 2016 to 2019
Companies that paid Dr. Merrill the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Patrick J. Merrill has 1 award and honors on record
Dmand AI lists 1 award for Dr. Merrill, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Merrill
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. Patrick J. Merrill graduated from University of Illinois College of Medicine - Chicago
Dr. Merrill graduated from University of Illinois College of Medicine - Chicago in 1984. Dr. Merrill is a member of ACC and ACP.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Patrick J. Merrill accepts plans from 1 insurance carrier
Dr. Merrill is in network with 1 carrier, including Kaiser Permanente. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
Plan types Dr. Merrill accepts, by number of carriers
- EPO1
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Patrick J. Merrill'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 services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Patrick J. Merrill
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. Patrick J. Merrill's NPI number?
Dr. Patrick J. Merrill's NPI number is 1952460545. It was assigned on December 8, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Patrick J. Merrill?
Dr. Patrick J. Merrill is an internist in Riverside, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Patrick J. Merrill practice?
Dr. Merrill practices at 10800 Magnolia Avenue, Riverside, CA 92505. Dr. Merrill's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
What is Dr. Patrick J. Merrill's office phone number?
The practice phone on file for Dr. Merrill is (951) 353-2000.
What is Dr. Patrick J. Merrill's medical license number?
Dr. Merrill holds California license G56039.
Which hospitals is Dr. Patrick J. Merrill affiliated with?
Dr. Merrill practices at Riverside Medical Center in Riverside, California.
What medical group is Dr. Patrick J. Merrill part of?
Dr. Merrill is linked to Southern California Permanente Medical Group.
Does Dr. Patrick J. Merrill accept Medicare?
Yes. CMS data shows Dr. Merrill billed Medicare for 17 services in 2017.
Is Dr. Patrick J. Merrill board certified?
Yes. Dr. Merrill is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Patrick J. Merrill bill to Medicare?
In 2017, Dr. Merrill's most billed Medicare services were office visit, established patient (99214).
Show 7 more questionsShow fewer questions
Where did Dr. Patrick J. Merrill go to medical school?
Dr. Merrill graduated from University of Illinois College of Medicine - Chicago in 1984.
What drugs does Dr. Patrick J. Merrill prescribe most?
In 2024 Medicare Part D data, Dr. Merrill's most prescribed drugs by claims were Paxlovid and Paxlovid (Eua).
Has Dr. Patrick J. Merrill received payments from drug or device companies?
CMS Open Payments shows $445 in general payments to Dr. Merrill from 4 companies from 2016 to 2019. The largest total came from Regeneron Pharmaceuticals, Inc.
How long has Dr. Patrick J. Merrill been practicing?
Dr. Merrill graduated from medical school in 1984, 42 years ago.
Does Dr. Patrick J. Merrill do research?
Dmand AI links 2 publications to Dr. Merrill, published from 2021 to 2023.
Who does Dr. Patrick J. Merrill publish with?
Dr. Merrill's most frequent co-authors are Michael Terry Ulrich (1 shared paper).
What insurance does Dr. Patrick J. Merrill accept?
Dr. Merrill is in network with 1 carrier, including Kaiser Permanente. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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