Dr. Michael Warren Nielsen, MD
- Part D claims, 2024
- 18
- Hospital affiliations
- 1
- Industry payments
- $81,974
- Medical group
- 1
- State license
- 1
- Practice address
- 200 West Arbor Drive, San Diego, CA 92103
- Practice phone
- Call (619) 543-6222
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Nielsen's professional email, personal email and mobile number
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Dr. Michael Warren Nielsen is an emergency medicine physician in San Diego, California
Dr. Nielsen practices at Hillcrest Medical Center in San Diego, California, part of University of California Health.
Dr. Nielsen's NPI, 1255301370, was assigned on January 23, 2006. Dr. Nielsen graduated from Wake Forest School of Medicine in 2000. Dr. Nielsen holds California license A79412.
- NPI
- 1255301370NPI Registry (opens in a new tab)
- NPI enumeration date
- January 23, 2006
- NPI status
- Active
- Practice phone
- (619) 543-6222
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael Warren Nielsen practices at Hillcrest Medical Center in San Diego, California
Dr. Nielsen's primary practice is Hillcrest Medical Center, at 200 West Arbor Drive, San Diego, CA 92103 in San Diego County. The practice phone is (619) 543-6222.
- Hillcrest Medical Center200 West Arbor Drive, San Diego, CA 92103 · San Diego CountyPhone(619) 543-6222
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael Warren Nielsen is affiliated with 1 site of care and 1 medical group
Dr. Nielsen's primary practice is Hillcrest Medical Center in San Diego, California, part of University of California Health. The medical group on file is Emergency Services Medical Corporation.
Sources: Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael Warren Nielsen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nielsen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hillcrest Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael Warren Nielsen is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Nielsen's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Nielsen is licensed in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near Dr. Nielsen
Counts of emergency medicine physicians 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. Michael Warren Nielsen's patients have a median age of 40
Across all payers, Dmand AI patient panel data puts Dr. Nielsen's median patient age at 40, with 17% women.
Dr. Nielsen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 40
Patient panel by sex, all payers
- Women17%
- Men83%
Source: Dmand AI Patient Panel Data
Dr. Michael Warren Nielsen wrote 18 Medicare Part D claims in 2024
In 2024, Dr. Nielsen wrote 18 Medicare Part D claims.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Michael Warren Nielsen received $81,974 in industry payments from 2016 to 2019
CMS Open Payments shows 114 general payments to Dr. Nielsen from 3 drug and device companies from 2016 to 2019. Speaker and faculty fees make up the largest share, 42% of the total. The Medicines Company paid the most, $40,005.
General payments to Dr. Nielsen by program year, 2016 to 2019
General payments to Dr. Nielsen by kind, 2016 to 2019
- Speaker and faculty fees$34,06742%
- Consulting fees$23,57129%
- Honoraria$11,88614%
- Travel and lodging$9,24511%
- Other$3,2054%
Companies that paid Dr. Nielsen 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. Michael Warren Nielsen graduated from Wake Forest School of Medicine
Dr. Nielsen graduated from Wake Forest School of Medicine in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Michael Warren Nielsen'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 DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (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. Michael Warren Nielsen
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. Michael Warren Nielsen's NPI number?
Dr. Michael Warren Nielsen's NPI number is 1255301370. It was assigned on January 23, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Warren Nielsen?
Dr. Michael Warren Nielsen is an emergency medicine physician in San Diego, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Michael Warren Nielsen practice?
Dr. Nielsen practices at 200 West Arbor Drive, San Diego, CA 92103. Dr. Nielsen's primary practice is Hillcrest Medical Center in San Diego, California, part of University of California Health.
What is Dr. Michael Warren Nielsen's office phone number?
The practice phone on file for Dr. Nielsen is (619) 543-6222.
What is Dr. Michael Warren Nielsen's medical license number?
Dr. Nielsen holds California license A79412.
Which hospitals is Dr. Michael Warren Nielsen affiliated with?
Dr. Nielsen practices at Hillcrest Medical Center in San Diego, California.
What medical group is Dr. Michael Warren Nielsen part of?
Dr. Nielsen is linked to Emergency Services Medical Corporation.
Where did Dr. Michael Warren Nielsen go to medical school?
Dr. Nielsen graduated from Wake Forest School of Medicine in 2000.
Has Dr. Michael Warren Nielsen received payments from drug or device companies?
CMS Open Payments shows $81,974 in general payments to Dr. Nielsen from 3 companies from 2016 to 2019. The largest total came from The Medicines Company.
How long has Dr. Michael Warren Nielsen been practicing?
Dr. Nielsen graduated from medical school in 2000, 26 years ago.
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