Biometric IdentificationFeasibility StudiesHealth Information Systems
Dr. Peter William Simpson, MD, MPH
NPI1043499478PAC ID5496835928
- Medicare services, 2024
- 663
- Medicare patients, 2024
- 340
- Part D claims, 2024
- 463
- Publications
- 2
- Hospital affiliations
- 1
- Practice address
- 701 E. El Camino Real, 1 Northwest, Mountain View, CA 94040
- Practice phone
- Call (408) 739-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Surgery Center Mountain View
Surgery Center - Medicare-Certified · Mountain View, California
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Dr. Peter William Simpson is a gastroenterologist in Mountain View, California
Dr. Simpson practices at Surgery Center Mountain View in Mountain View, California.
Dr. Simpson's NPI, 1043499478, was assigned on November 2, 2007. Dr. Simpson holds California license A71224.
NPI and contact details
- NPI
- 1043499478NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5496835928
- NPI enumeration date
- November 2, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (408) 739-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- 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. Peter William Simpson practices at Surgery Center Mountain View in Mountain View, California
Dr. Simpson's primary practice is Surgery Center Mountain View, at 701 E. El Camino Real, 1 Northwest, Mountain View, CA 94040. The practice phone is (408) 739-6000.
- Surgery Center Mountain View701 E. El Camino Real, 1 Northwest, Mountain View, CA 94040Phone(408) 739-6000
Source: Dmand AI Affiliation Data
Dr. Peter William Simpson is affiliated with 3 sites of care and 1 medical group
Dr. Simpson's primary practice is Surgery Center Mountain View in Mountain View, California. Dr. Simpson is also affiliated with El Camino Health - Mountain View Hospital. The medical group on file is Palo Alto Foundation Medical Group. Dmand AI also links Dr. Simpson to 1 more group practice or clinic, named with a free account.
Surgery Center Mountain ViewPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Peter William Simpson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Simpson practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Surgery Center Mountain View | 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. Peter William Simpson is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Simpson's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Simpson is licensed in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Gastroenterologists near Dr. Simpson
Counts of gastroenterologists 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. Peter William Simpson billed Medicare for 663 services in 2024
CMS data shows 663 Medicare services from Dr. Simpson across 13 procedure codes in 2024, for 340 Medicare patients. Medicare paid $67,186 for them.
Medicare services, 2024663
Medicare patients340
Paid by Medicare$67,186
Procedure codes13
Dr. Simpson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 2232024: 26017%
- Other services
- 2023: 1782024: 21521%
- Office and hospital visits
- 2023: 1622024: 18816%
Where Dr. Simpson's Medicare services took place, 2024
- In an office17226%
- In a facility49174%
Dr. Simpson compared with the California median for gastroenterologists, 2024
- Dr. Simpson
- California median
- Medicare services
- 663vs 58613% above
- Medicare patients
- 340vs 30213% above
- Part D claims
- 310vs 38018% below
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Simpson'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. Simpson and other gastroenterologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Peter William Simpson treated 340 Medicare patients in 2024, average age 75
CMS counts 340 Medicare patients who saw Dr. Simpson in 2024. The largest group is 65 to 74, with 178 patients. 71% of them have high cholesterol, and 55% have high blood pressure. 7% are also on Medicaid. Their average risk score is 0.97, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Simpson's median patient age at 56, with 41% women.
Medicare patients, 2024340
Average age75
Average risk score0.97
Also on Medicaid7%
Dr. Simpson's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Simpson's Medicare patients by sex, 2024
- Women15345%
- Men18755%
Chronic conditions among Dr. Simpson's Medicare patients, 2024
- High cholesterol71%
- High blood pressure55%
- Arthritis35%
- Diabetes23%
- Cancer19%
- Chronic kidney disease19%
- Osteoporosis17%
- Anxiety16%
Share of Medicare patients with each condition. A patient can have several.
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 56
Patient panel by sex, all payers
- Women41%
- Men59%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Peter William Simpson wrote 463 Medicare Part D claims in 2024
In 2024, Dr. Simpson wrote 463 Medicare Part D claims for 269 patients. 78% of them were for generic drugs. CMS names the drug for 310 of them, across 7 drugs with 11 or more claims each, at $16,294 in total drug cost. In 2023, CMS named 335 claims across 6 drugs.
Part D claims, 2024463
Drugs named by CMS7
Total drug cost$16,294
Part D patients269
Dr. Simpson's Part D claims by kind of drug, 2024
- Generic361 claims78%
- Brand-name102 claims22%
Dr. Simpson'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: 3352024: 3107%
Drugs named by CMS: 7 in 2024, 6 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
Dr. Peter William Simpson ranks in the 77th percentile for colonoscopy in Medicare
Dr. Simpson accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Simpson as offering telehealth. CMS counts 88 procedures of colonoscopy by Dr. Simpson, more than 77% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Simpson ranks in Medicare procedure volume
- Colonoscopy
- 77th percentile88 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 68th percentile64 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Peter William Simpson has 2 publications on record
Dmand AI links 2 papers to Dr. Simpson, published from 2013 to 2019.
Papers2
Years published2013 to 2019
Recent publications by Dr. Simpson
Cardiovascular DiseasesC-Reactive ProteinImmunoassay
See who Dr. Simpson researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Simpson works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Peter William Simpson received $551 in industry payments from 2016 to 2025
CMS Open Payments shows 11 general payments to Dr. Simpson from 6 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $336.
General payments to Dr. Simpson by program year, 2016 to 2025
Companies that paid Dr. Simpson the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Peter William 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 | 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)Doctors and Clinicians Utilization Data (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) |
| 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. Peter William 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. Peter William Simpson's NPI number?
Dr. Peter William Simpson's NPI number is 1043499478. It was assigned on November 2, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Peter William Simpson?
Dr. Peter William Simpson is a gastroenterologist in Mountain View, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Peter William Simpson practice?
Dr. Simpson practices at 701 E. El Camino Real, 1 Northwest, Mountain View, CA 94040. Dr. Simpson's primary practice is Surgery Center Mountain View in Mountain View, California. Dmand AI also links Dr. Simpson to 1 group practice or clinic.
What is Dr. Peter William Simpson's office phone number?
The practice phone on file for Dr. Simpson is (408) 739-6000.
What is Dr. Peter William Simpson's medical license number?
Dr. Simpson holds California license A71224.
Which hospitals is Dr. Peter William Simpson affiliated with?
Dr. Simpson is affiliated with El Camino Health - Mountain View Hospital.
What medical group is Dr. Peter William Simpson part of?
Dr. Simpson is linked to Palo Alto Foundation Medical Group.
Does Dr. Peter William Simpson accept Medicare?
Yes. CMS data shows Dr. Simpson billed Medicare for 663 services in 2024, and Dr. Simpson accepts Medicare assignment.
Does Dr. Peter William Simpson offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Simpson as offering telehealth services.
How many Medicare patients does Dr. Peter William Simpson see?
CMS counts 340 Medicare patients who saw Dr. Simpson in 2024, with an average age of 75.
Show 5 more questionsShow fewer questions
What services does Dr. Peter William Simpson bill to Medicare?
In 2024, Dr. Simpson's most billed Medicare services were medicare service (G0500), surgery: digestive system (45385) and office visit, established patient (99214).
What drugs does Dr. Peter William Simpson prescribe most?
In 2024 Medicare Part D data, Dr. Simpson's most prescribed drugs by claims were Sod Sulf-Potass Sulf-Mag Sulf, Peg 3350-Electrolyte and Pantoprazole Sodium.
Has Dr. Peter William Simpson received payments from drug or device companies?
CMS Open Payments shows $551 in general payments to Dr. Simpson from 6 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Peter William Simpson been practicing?
Dr. Simpson graduated from medical school in 2000, 26 years ago.
Does Dr. Peter William Simpson do research?
Dmand AI links 2 publications to Dr. Simpson, published from 2013 to 2019.
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