Dr. James D. Simpson, MD
- Medicare services, 2019
- 20
- Part D claims, 2020
- 18
- Hospital affiliations
- 1
- Industry payments
- $348
- Medical group
- 1
- Practice address
- 40680 California Oaks Rd, Murrieta, CA 92562
- Practice phone
- Call (469) 466-7007
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Signify Health, LLC
Murrieta, California
Find Dr. Simpson'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. James D. Simpson is a vascular surgeon in Murrieta, California
Dr. Simpson practices at Signify Health, LLC in Murrieta, California.
Dr. Simpson's NPI, 1598813396, was assigned on January 8, 2007. Dr. Simpson holds California license G20839.
- NPI
- 1598813396NPI Registry (opens in a new tab)
- NPI enumeration date
- January 8, 2007
- NPI status
- Active
- Practice phone
- (469) 466-7007
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. James D. Simpson practices at Signify Health, LLC in Murrieta, California
Dr. Simpson's primary practice is Signify Health, LLC, at 40680 California Oaks Rd, Murrieta, CA 92562 in Riverside County. The practice phone is (469) 466-7007.
- Signify Health, LLC40680 California Oaks Rd, Murrieta, CA 92562 · Riverside CountyPhone(469) 466-7007
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. James D. Simpson is affiliated with 2 sites of care and 1 medical group
Dr. Simpson's primary practice is Signify Health, LLC in Murrieta, California. Dr. Simpson is also affiliated with Riverside Medical Center. The medical group on file is Signify Health.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. James D. Simpson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Simpson practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Signify Health, LLC | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. James D. Simpson is one of 532 vascular surgeons in California
Vascular surgery is Dr. Simpson's primary specialty in the NPI Registry, under taxonomy code 2086S0129X. Dr. Simpson is licensed in California.
Specialties and state licenses
- Vascular surgery, CaliforniaPrimary
Vascular surgeons near Dr. Simpson
Counts of vascular surgeons 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. James D. Simpson billed Medicare for 20 services in 2019
CMS data shows 20 Medicare services from Dr. Simpson across 1 procedure code in 2019, all of them office visits. Medicare paid $652 for them. Every service was in an office.
Dr. Simpson's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 162019: 2025%
Dr. Simpson compared with the California median for vascular surgeons, 2019
- Dr. Simpson
- California median
- Medicare services
- 20vs 60997% below
- Part D claims
- 18vs 5567% below
Medians across 499 vascular surgeons in California with Dmand AI profiles that report each measure.
Dr. Simpson's most billed Medicare procedure codes, 2019
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. Simpson?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Simpson and other vascular surgeons in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. James D. Simpson's patients have a median age of 75
Across all payers, Dmand AI patient panel data puts Dr. Simpson's median patient age at 75, with 47% women.
Dr. Simpson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women47%
- Men45%
Source: Dmand AI Patient Panel Data
Dr. James D. Simpson wrote 18 Medicare Part D claims in 2020
In 2020, Dr. Simpson wrote 18 Medicare Part D claims. They cover 1 drug, with $436 in total drug cost. In 2019, CMS named 90 claims across 3 drugs.
Dr. Simpson's most prescribed drugs by claims, 2020
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, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 902020: 1880%
Drugs named by CMS: 1 in 2020, 3 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. James D. Simpson received $348 in industry payments from 2016 to 2022
CMS Open Payments shows 6 general payments to Dr. Simpson from 4 drug and device companies from 2016 to 2022. Food and beverage make up the largest share, 100% of the total. W. L. Gore & Associates, Inc. paid the most, $149.
General payments to Dr. Simpson by program year, 2016 to 2022
Companies that paid Dr. Simpson the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. James D. Simpson'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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) |
| 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 Dr. James D. Simpson
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. James D. Simpson's NPI number?
Dr. James D. Simpson's NPI number is 1598813396. It was assigned on January 8, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. James D. Simpson?
Dr. James D. Simpson is a vascular surgeon in Murrieta, California. The primary specialty in the NPI Registry is Vascular Surgery Physician (taxonomy code 2086S0129X).
Where does Dr. James D. Simpson practice?
Dr. Simpson practices at 40680 California Oaks Rd, Murrieta, CA 92562. Dr. Simpson's primary practice is Signify Health, LLC in Murrieta, California.
What is Dr. James D. Simpson's office phone number?
The practice phone on file for Dr. Simpson is (469) 466-7007.
What is Dr. James D. Simpson's medical license number?
Dr. Simpson holds California license G20839.
Which hospitals is Dr. James D. Simpson affiliated with?
Dr. Simpson is affiliated with Riverside Medical Center.
What medical group is Dr. James D. Simpson part of?
Dr. Simpson is linked to Signify Health.
Does Dr. James D. Simpson accept Medicare?
Yes. CMS data shows Dr. Simpson billed Medicare for 20 services in 2019.
What services does Dr. James D. Simpson bill to Medicare?
In 2019, Dr. Simpson's most billed Medicare services were office visit, established patient (99212).
What drugs does Dr. James D. Simpson prescribe most?
In 2020 Medicare Part D data, Dr. Simpson's most prescribed drugs by claims were Clopidogrel.
Has Dr. James D. Simpson received payments from drug or device companies?
CMS Open Payments shows $348 in general payments to Dr. Simpson from 4 companies from 2016 to 2022. The largest total came from W. L. Gore & Associates, Inc.
How long has Dr. James D. Simpson been practicing?
Dr. Simpson's NPI was assigned in 2007.
Selling to vascular surgery practices?
See vascular surgeons in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card