Donald Zumwalt
- Medicare services, 2020
- 292
- Part D claims, 2019
- 11
- Industry payments
- $125
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 2333 Buchanan St, San Francisco, CA 94115-1925
- Practice phone
- Call (925) 634-9704
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Inpatient Management Medical Group
Primary care practice · San Francisco, California
Find Donald Zumwalt'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.
Donald Zumwalt is an internist in San Francisco, California
Donald Zumwalt practices at Inpatient Management Medical Group in San Francisco, California.
Donald Zumwalt's NPI, 1457489825, was assigned on February 28, 2007. Donald Zumwalt holds California license G50572.
- NPI
- 1457489825NPI Registry (opens in a new tab)
- NPI enumeration date
- February 28, 2007
- NPI status
- Active
- Practice phone
- (925) 634-9704
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Donald Zumwalt practices at Inpatient Management Medical Group in San Francisco, California
Donald Zumwalt's primary practice is Inpatient Management Medical Group, at 2333 Buchanan St, San Francisco, CA 94115-1925. The practice phone is (925) 634-9704.
- Inpatient Management Medical Group2333 Buchanan St, San Francisco, CA 94115-1925Phone(925) 634-9704
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Donald Zumwalt is affiliated with 1 site of care and 1 medical group
Donald Zumwalt's primary practice is Inpatient Management Medical Group in San Francisco, California. Dmand AI also links Donald Zumwalt to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Donald Zumwalt's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Donald Zumwalt practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Inpatient Management Medical Group | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Donald Zumwalt is one of 16,751 internists in California
Internal medicine is Donald Zumwalt's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Donald Zumwalt is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Donald Zumwalt
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
Donald Zumwalt billed Medicare for 292 services in 2020
CMS data shows 292 Medicare services from Donald Zumwalt across 5 procedure codes in 2020. Medicare paid $27,609 for them. Every service was in a facility, such as a hospital, rather than an office.
Donald Zumwalt's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 5032020: 27046%
- Other services
- 2019: 262020: 2215%
Donald Zumwalt compared with the California median for internists, 2020
- Donald Zumwalt
- California median
- Medicare services
- 292vs 36119% below
- Part D claims
- 11vs 42197% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Donald Zumwalt's most billed Medicare procedure codes, 2020
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 Donald Zumwalt?
Medicare shows one payer. Book a meeting to get commercial claims data for Donald Zumwalt and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Donald Zumwalt's patients have a median age of 76
Across all payers, Dmand AI patient panel data puts Donald Zumwalt's median patient age at 76, with 63% women.
Donald Zumwalt's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women63%
- Men31%
Source: Dmand AI Patient Panel Data
Donald Zumwalt wrote 11 Medicare Part D claims in 2019
In 2019, Donald Zumwalt wrote 11 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $72 in total drug cost. In 2016, CMS named 74 claims across 5 drugs.
Donald Zumwalt's most prescribed drugs by claims, 2019
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, 2016 to 2019
- 2016
- 2019
- Claims for drugs CMS names
- 2016: 742019: 1185%
Drugs named by CMS: 1 in 2019, 5 in 2016.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Donald Zumwalt received $125 in industry payments from 2016 to 2017
CMS Open Payments shows 2 general payments to Donald Zumwalt from 2 drug and device companies from 2016 to 2017. Food and beverage make up the largest share, 100% of the total. Bristol-Myers Squibb Company paid the most, $109.
General payments to Donald Zumwalt by program year, 2016 to 2017
Companies that paid Donald Zumwalt the most, 2016 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Donald Zumwalt'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) |
| 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 Donald Zumwalt
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Donald Zumwalt's NPI number?
Donald Zumwalt's NPI number is 1457489825. It was assigned on February 28, 2007, and it is active in the NPI Registry.
What does Donald Zumwalt specialize in?
Donald Zumwalt is an internist in San Francisco, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Donald Zumwalt practice?
Donald Zumwalt practices at 2333 Buchanan St, San Francisco, CA 94115-1925. Donald Zumwalt's primary practice is Inpatient Management Medical Group in San Francisco, California. Dmand AI also links Donald Zumwalt to 1 medical group.
What is Donald Zumwalt's office phone number?
The practice phone on file for Donald Zumwalt is (925) 634-9704.
What is Donald Zumwalt's medical license number?
Donald Zumwalt holds California license G50572.
Does Donald Zumwalt accept Medicare?
Yes. CMS data shows Donald Zumwalt billed Medicare for 292 services in 2020.
What services does Donald Zumwalt bill to Medicare?
In 2020, Donald Zumwalt's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).
What drugs does Donald Zumwalt prescribe most?
In 2019 Medicare Part D data, Donald Zumwalt's most prescribed drugs by claims were Prednisone.
Has Donald Zumwalt received payments from drug or device companies?
CMS Open Payments shows $125 in general payments to Donald Zumwalt from 2 companies from 2016 to 2017. The largest total came from Bristol-Myers Squibb Company.
How long has Donald Zumwalt been practicing?
Donald Zumwalt's NPI was assigned in 2007.
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