Dr. Stephen Edward Welter, MD
- Medicare services, 2021
- 459
- Part D claims, 2024
- 609
- Hospital affiliations
- 1
- Industry payments
- $210
- Medical group
- 1
- Practice address
- 250 Bon Air Road, Greenbrae, CA 94904
- Practice phone
- Call (415) 925-7900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Stephen Edward Welter is an internist in Greenbrae, California
Dr. Welter practices at MarinHealth Medical Center in Greenbrae, California, part of Marin Healthcare District.
Dr. Welter's NPI, 1801906136, was assigned on August 30, 2006. Dr. Welter graduated from University of Nebraska College of Medicine in 1977. Dr. Welter holds California license G37927.
- NPI
- 1801906136NPI Registry (opens in a new tab)
- NPI enumeration date
- August 30, 2006
- NPI status
- Active
- Practice phone
- (415) 925-7900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 75
- Medical school graduation
- 1977
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Stephen Edward Welter practices at MarinHealth Medical Center in Greenbrae, California
Dr. Welter's primary practice is MarinHealth Medical Center, at 250 Bon Air Road, Greenbrae, CA 94904 in Marin County. The practice phone is (415) 925-7900.
- MarinHealth Medical Center250 Bon Air Road, Greenbrae, CA 94904 · Marin CountyPhone(415) 925-7900
Source: Dmand AI Affiliation Data
Dr. Stephen Edward Welter is affiliated with 2 sites of care and 1 medical group
Dr. Welter's primary practice is MarinHealth Medical Center in Greenbrae, California, part of Marin Healthcare District. Dmand AI also links Dr. Welter to 1 ambulatory surgery center and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Stephen Edward Welter's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Welter practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MarinHealth Medical Center | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Stephen Edward Welter is one of 16,751 internists in California
Internal medicine is Dr. Welter's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Welter is board certified in internal medicine by the American Board of Internal Medicine. Dr. Welter is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Welter
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. Stephen Edward Welter billed Medicare for 459 services in 2021
CMS data shows 459 Medicare services from Dr. Welter across 7 procedure codes in 2021. Medicare paid $36,627 for them. Every service was in an office.
Dr. Welter's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 8182021: 32061%
- Other services
- 2020: 3852021: 9675%
- Tests and treatments
- 2020: 2222021: 4381%
- Drugs given in the office
- 2020: 1,0202021: 0100%
Dr. Welter compared with the California median for internists, 2021
- Dr. Welter
- California median
- Medicare services
- 459vs 36127% above
- Part D claims
- 302vs 42128% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Welter's most billed Medicare procedure codes, 2021
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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stephen Edward Welter's patients have a median age of 85
Across all payers, Dmand AI patient panel data puts Dr. Welter's median patient age at 85, with 51% women.
Dr. Welter's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 85
Patient panel by sex, all payers
- Women51%
- Men47%
Source: Dmand AI Patient Panel Data
Dr. Stephen Edward Welter wrote 609 Medicare Part D claims in 2024
In 2024, Dr. Welter wrote 609 Medicare Part D claims for 79 patients. 86% of them were for generic drugs. CMS names the drug for 302 of them, across 14 drugs with 11 or more claims each, at $32,796 in total drug cost. In 2023, CMS named 347 claims across 17 drugs.
Dr. Welter's Part D claims by kind of drug, 2024
- Generic521 claims86%
- Brand-name88 claims14%
Dr. Welter'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. Welter's Part D claims, 2024
- Antibiotics5%32 of 609 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: 3472024: 30213%
Drugs named by CMS: 14 in 2024, 17 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. Stephen Edward Welter received $210 in industry payments from 2016 to 2024
CMS Open Payments shows 11 general payments to Dr. Welter from 7 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Bristol-Myers Squibb Company paid the most, $56.
General payments to Dr. Welter by program year, 2016 to 2024
Companies that paid Dr. Welter the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Stephen Edward Welter graduated from University of Nebraska College of Medicine
Dr. Welter graduated from University of Nebraska College of Medicine in 1977.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Stephen Edward Welter accepts plans from 4 insurance carriers
Dr. Welter is in network with 4 carriers, including Aetna, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Humana
Plan types Dr. Welter accepts, by number of carriers
- Medicare3
- PPO3
- HMO2
- EPO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Stephen Edward Welter'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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Stephen Edward Welter
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. Stephen Edward Welter's NPI number?
Dr. Stephen Edward Welter's NPI number is 1801906136. It was assigned on August 30, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Stephen Edward Welter?
Dr. Stephen Edward Welter is an internist in Greenbrae, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Stephen Edward Welter practice?
Dr. Welter practices at 250 Bon Air Road, Greenbrae, CA 94904. Dr. Welter's primary practice is MarinHealth Medical Center in Greenbrae, California, part of Marin Healthcare District. Dmand AI also links Dr. Welter to 1 ambulatory surgery center and 1 medical group.
What is Dr. Stephen Edward Welter's office phone number?
The practice phone on file for Dr. Welter is (415) 925-7900.
What is Dr. Stephen Edward Welter's medical license number?
Dr. Welter holds California license G37927.
Which hospitals is Dr. Stephen Edward Welter affiliated with?
Dr. Welter practices at MarinHealth Medical Center in Greenbrae, California.
Does Dr. Stephen Edward Welter accept Medicare?
Yes. CMS data shows Dr. Welter billed Medicare for 459 services in 2021.
Is Dr. Stephen Edward Welter board certified?
Yes. Dr. Welter is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Stephen Edward Welter bill to Medicare?
In 2021, Dr. Welter's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and office visit, established patient (99213).
Where did Dr. Stephen Edward Welter go to medical school?
Dr. Welter graduated from University of Nebraska College of Medicine in 1977.
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What drugs does Dr. Stephen Edward Welter prescribe most?
In 2024 Medicare Part D data, Dr. Welter's most prescribed drugs by claims were Amlodipine Besylate, Atorvastatin Calcium and Levothyroxine Sodium.
Has Dr. Stephen Edward Welter received payments from drug or device companies?
CMS Open Payments shows $210 in general payments to Dr. Welter from 7 companies from 2016 to 2024. The largest total came from Bristol-Myers Squibb Company.
How long has Dr. Stephen Edward Welter been practicing?
Dr. Welter graduated from medical school in 1977, 49 years ago.
What insurance does Dr. Stephen Edward Welter accept?
Dr. Welter is in network with 4 carriers, including Aetna, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
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