Dr. Jonathan S. Warnelo, DO
- Medicare services, 2024
- 1,300
- Medicare patients, 2024
- 173
- Part D claims, 2024
- 415
- Hospital affiliations
- 2
- Industry payments
- $1,470
- Practice address
- 12601 Garden Grove Blvd, Garden Grove, CA 92843
- Practice phone
- Call (714) 537-5160
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Warnelo'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. Jonathan S. Warnelo is an internist in Garden Grove, California
Dr. Warnelo practices at Garden Grove Hospital Medical Center in Garden Grove, California, part of Prime Healthcare Services.
Dr. Warnelo's NPI, 1467980854, was assigned on May 30, 2017. Dr. Warnelo graduated from Lake Erie College of Osteopathic Medicine, Erie in 2016. Dr. Warnelo holds California license 20A16595.
- NPI
- 1467980854NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3476881251
- NPI enumeration date
- May 30, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (714) 537-5160
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jonathan S. Warnelo practices at Garden Grove Hospital Medical Center in Garden Grove, California
Dr. Warnelo's primary practice is Garden Grove Hospital Medical Center, at 12601 Garden Grove Blvd, Garden Grove, CA 92843 in Orange County. The practice phone is (714) 537-5160.
- Garden Grove Hospital Medical Center12601 Garden Grove Blvd, Garden Grove, CA 92843 · Orange CountyPhone(714) 537-5160
Source: Dmand AI Affiliation Data
Dr. Jonathan S. Warnelo is affiliated with 3 sites of care and 1 medical group
Dr. Warnelo's primary practice is Garden Grove Hospital Medical Center in Garden Grove, California, part of Prime Healthcare Services. Dr. Warnelo is also affiliated with West Anaheim Medical Center. The medical group on file is Pathway Medical Group. Dmand AI also links Dr. Warnelo 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. Jonathan S. Warnelo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Warnelo practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Garden Grove Hospital 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. Jonathan S. Warnelo is one of 16,751 internists in California
Internal medicine is Dr. Warnelo's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Warnelo is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Warnelo
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. Jonathan S. Warnelo billed Medicare for 1,300 services in 2024
CMS data shows 1,300 Medicare services from Dr. Warnelo across 3 procedure codes in 2024, for 173 Medicare patients. Medicare paid $92,525 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Warnelo's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,9262024: 1,30033%
Dr. Warnelo compared with the California median for internists, 2024
- Dr. Warnelo
- California median
- Medicare services
- 1,300vs 3613.6 times
- Medicare patients
- 173vs 15115% above
- Part D claims
- 228vs 42146% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Warnelo's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Warnelo and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jonathan S. Warnelo treated 173 Medicare patients in 2024, average age 79
CMS counts 173 Medicare patients who saw Dr. Warnelo in 2024. The largest group is 75 to 84, with 69 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 87% are also on Medicaid. Their average risk score is 4.06, 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. Warnelo's median patient age at 65, with 50% women.
Dr. Warnelo's Medicare patients by age, 2024
Dr. Warnelo's Medicare patients by sex, 2024
- Women7644%
- Men9756%
Chronic conditions among Dr. Warnelo's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Heart failure69%
- Chronic kidney disease67%
- Diabetes66%
- Alzheimer's and dementia58%
- Ischemic heart disease55%
- Mood disorders52%
Share of Medicare patients with each condition. A patient can have several.
Dr. Warnelo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women50%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jonathan S. Warnelo wrote 415 Medicare Part D claims in 2024
In 2024, Dr. Warnelo wrote 415 Medicare Part D claims for 119 patients. 91% of them were for generic drugs. CMS names the drug for 228 of them, across 14 drugs with 11 or more claims each, at $6,460 in total drug cost. In 2023, CMS named 158 claims across 9 drugs.
Dr. Warnelo's Part D claims by kind of drug, 2024
- Generic377 claims91%
- Brand-name38 claims9%
Dr. Warnelo'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. Warnelo's Part D claims, 2024
- Opioids4%17 of 415 claims
- Antibiotics14%59 of 415 claims
- Antipsychotics, patients 65 and over6%23 of 415 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: 1582024: 22844%
Drugs named by CMS: 14 in 2024, 9 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. Jonathan S. Warnelo takes part in Medicare
Dr. Warnelo 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. Jonathan S. Warnelo received $1,470 in industry payments from 2019 to 2022
CMS Open Payments shows 38 general payments to Dr. Warnelo from 10 drug and device companies from 2019 to 2022. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $530.
General payments to Dr. Warnelo by program year, 2019 to 2022
Companies that paid Dr. Warnelo the most, 2019 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jonathan S. Warnelo graduated from Lake Erie College of Osteopathic Medicine, Erie
Dr. Warnelo graduated from Lake Erie College of Osteopathic Medicine, Erie in 2016.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Jonathan S. Warnelo'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 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) |
| Industry payments | Open Payments (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. Jonathan S. Warnelo
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. Jonathan S. Warnelo's NPI number?
Dr. Jonathan S. Warnelo's NPI number is 1467980854. It was assigned on May 30, 2017, and it is active in the NPI Registry.
What kind of doctor is Dr. Jonathan S. Warnelo?
Dr. Jonathan S. Warnelo is an internist in Garden Grove, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Jonathan S. Warnelo practice?
Dr. Warnelo practices at 12601 Garden Grove Blvd, Garden Grove, CA 92843. Dr. Warnelo's primary practice is Garden Grove Hospital Medical Center in Garden Grove, California, part of Prime Healthcare Services. Dmand AI also links Dr. Warnelo to 1 group practice or clinic.
What is Dr. Jonathan S. Warnelo's office phone number?
The practice phone on file for Dr. Warnelo is (714) 537-5160.
What is Dr. Jonathan S. Warnelo's medical license number?
Dr. Warnelo holds California license 20A16595.
Which hospitals is Dr. Jonathan S. Warnelo affiliated with?
Dr. Warnelo practices at Garden Grove Hospital Medical Center in Garden Grove, California. Dr. Warnelo is also affiliated with West Anaheim Medical Center.
What medical group is Dr. Jonathan S. Warnelo part of?
Dr. Warnelo is linked to Pathway Medical Group.
Does Dr. Jonathan S. Warnelo accept Medicare?
Yes. CMS data shows Dr. Warnelo billed Medicare for 1,300 services in 2024, and Dr. Warnelo accepts Medicare assignment.
How many Medicare patients does Dr. Jonathan S. Warnelo see?
CMS counts 173 Medicare patients who saw Dr. Warnelo in 2024, with an average age of 79.
What services does Dr. Jonathan S. Warnelo bill to Medicare?
In 2024, Dr. Warnelo's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99223) and hospital inpatient care (99233).
Show 4 more questionsShow fewer questions
Where did Dr. Jonathan S. Warnelo go to medical school?
Dr. Warnelo graduated from Lake Erie College of Osteopathic Medicine, Erie in 2016.
What drugs does Dr. Jonathan S. Warnelo prescribe most?
In 2024 Medicare Part D data, Dr. Warnelo's most prescribed drugs by claims were Amlodipine Besylate, Pantoprazole Sodium and Olanzapine.
Has Dr. Jonathan S. Warnelo received payments from drug or device companies?
CMS Open Payments shows $1,470 in general payments to Dr. Warnelo from 10 companies from 2019 to 2022. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Jonathan S. Warnelo been practicing?
Dr. Warnelo graduated from medical school in 2016, 10 years ago.
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