Katherine Janet Ziesing, PA-C
- Medicare services, 2024
- 14,721
- Medicare patients, 2024
- 991
- Part D claims, 2024
- 402
- MIPS score, 2024
- 84
- Hospital affiliations
- 3
- Practice address
- 3700 California St, San Francisco, CA 94118
- Practice phone
- Call (415) 600-6200
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
California Pacific Medical Center
San Francisco, California
Find Katherine Ziesing's professional email, personal email and mobile number
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Katherine Janet Ziesing is a physician assistant in San Francisco, California
Katherine Ziesing practices at California Pacific Medical Center in San Francisco, California.
Katherine Ziesing's NPI, 1710467774, was assigned on August 20, 2018. Katherine Ziesing holds California license PA55873.
- NPI
- 1710467774NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6901158302
- NPI enumeration date
- August 20, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (415) 600-6200
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Katherine Janet Ziesing practices at California Pacific Medical Center in San Francisco, California
Katherine Ziesing's primary practice is California Pacific Medical Center, at 3700 California St, San Francisco, CA 94118 in San Francisco County. The practice phone is (415) 600-6200.
- California Pacific Medical Center3700 California St, San Francisco, CA 94118 · San Francisco CountyPhone(415) 600-6200
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Katherine Janet Ziesing is affiliated with 6 sites of care and 2 medical groups
Katherine Ziesing's primary practice is California Pacific Medical Center in San Francisco, California. Katherine Ziesing is also affiliated with MarinHealth Medical Center. The medical group on file is UCSF Clinical Integrated Partners. Dmand AI also links Katherine Ziesing to 2 more hospitals, 2 group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Katherine Janet Ziesing's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Katherine Ziesing practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| California Pacific Medical Center | Available with a free account |
| +5 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Katherine Janet Ziesing is one of 11,482 physician assistants in California
Physician assistant is Katherine Ziesing's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Katherine Ziesing is licensed in California.
Specialties and state licenses
- Physician assistant, CaliforniaPrimary
Clinical focus
Dmand AI lists acute skin infection, arthritis, broken or dislocated ankle/ or foot, bursitis, enthesopathy in arms, fibromyalgia and chronic pain, fluid in a joint and hand joint or tendon inflammation among the conditions Katherine Ziesing treats.
Physician assistants near Katherine Ziesing
Counts of physician assistants 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
Katherine Janet Ziesing billed Medicare for 14,721 services in 2024
CMS data shows 14,721 Medicare services from Katherine Ziesing across 21 procedure codes in 2024, for 991 Medicare patients. Medicare paid $229,011 for them. Every service was in an office.
Katherine Ziesing's Medicare services by type, 2024
- Drugs given in the office11,848
- Office and hospital visits1,317
- Imaging839
- Surgery717
Katherine Ziesing compared with the California median for physician assistants, 2024
- Katherine Ziesing
- California median
- Medicare services
- 14,721vs 20472.2 times
- Medicare patients
- 991vs 1059.4 times
- Part D claims
- 325vs 24334% above
Medians across 7,065 physician assistants in California with Dmand AI profiles that report each measure.
Katherine Ziesing'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Katherine Janet Ziesing treated 991 Medicare patients in 2024, average age 76
CMS counts 991 Medicare patients who saw Katherine Ziesing in 2024. The largest group is 75 to 84, with 463 patients. 75% of them have arthritis, and 75% have high cholesterol. 5% are also on Medicaid. Their average risk score is 0.86, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Katherine Ziesing's median patient age at 74, with 66% women.
Katherine Ziesing's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Katherine Ziesing's Medicare patients by sex, 2024
- Women64965%
- Men34235%
Chronic conditions among Katherine Ziesing's Medicare patients, 2024
- Arthritis75%
- High cholesterol75%
- High blood pressure59%
- Ischemic heart disease23%
- Mood disorders21%
- Osteoporosis21%
- Anxiety20%
- Depression18%
Share of Medicare patients with each condition. A patient can have several.
Katherine Ziesing's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women66%
- Men31%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Katherine Janet Ziesing wrote 402 Medicare Part D claims in 2024
In 2024, Katherine Ziesing wrote 402 Medicare Part D claims for 242 patients. 98% of them were for generic drugs. CMS names the drug for 325 of them, across 8 drugs with 11 or more claims each, at $3,435 in total drug cost.
Katherine Ziesing's Part D claims by kind of drug, 2024
- Generic394 claims98%
- Brand-name and other8 claims2%
Katherine Ziesing'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 Katherine Ziesing's Part D claims, 2024
- Opioids46%185 of 402 claims
- Antibiotics22%88 of 402 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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
Katherine Janet Ziesing scored 84 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 84 out of 100 for Katherine Ziesing for performance year 2024, reported as part of a group. Katherine Ziesing accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Katherine Ziesing as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Katherine Ziesing's MIPS scores, performance year 2024
- 84of 100Final score
- 90.5of 100Quality
- 76of 100Promoting Interoperability
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Katherine Janet Ziesing received $52 in industry payments in 2025
CMS Open Payments shows 3 general payments to Katherine Ziesing from 2 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Bioventus LLC paid the most, $32.
Companies that paid Katherine Ziesing the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Katherine Janet Ziesing's profile data
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Katherine Janet Ziesing
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What is Katherine Janet Ziesing's NPI number?
Katherine Janet Ziesing's NPI number is 1710467774. It was assigned on August 20, 2018, and it is active in the NPI Registry.
What does Katherine Janet Ziesing specialize in?
Katherine Janet Ziesing is a physician assistant in San Francisco, California. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Katherine Janet Ziesing practice?
Katherine Ziesing practices at 3700 California St, San Francisco, CA 94118. Katherine Ziesing's primary practice is California Pacific Medical Center in San Francisco, California. Dmand AI also links Katherine Ziesing to 2 hospitals, 2 group practices and clinics and 1 medical group.
What is Katherine Janet Ziesing's office phone number?
The practice phone on file for Katherine Ziesing is (415) 600-6200.
What is Katherine Janet Ziesing's medical license number?
Katherine Ziesing holds California license PA55873.
Which hospitals is Katherine Janet Ziesing affiliated with?
Katherine Ziesing is affiliated with MarinHealth Medical Center. Dmand AI links Katherine Ziesing to 2 more hospitals.
What medical group is Katherine Janet Ziesing part of?
Katherine Ziesing is linked to UCSF Clinical Integrated Partners. Dmand AI links Katherine Ziesing to 1 more medical group.
Does Katherine Janet Ziesing accept Medicare?
Yes. CMS data shows Katherine Ziesing billed Medicare for 14,721 services in 2024, and Katherine Ziesing accepts Medicare assignment.
Does Katherine Janet Ziesing offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Katherine Ziesing as offering telehealth services.
What is Katherine Janet Ziesing's MIPS score?
Katherine Ziesing's MIPS final score for performance year 2024 is 84 out of 100, reported as part of a group.
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How many Medicare patients does Katherine Janet Ziesing see?
CMS counts 991 Medicare patients who saw Katherine Ziesing in 2024, with an average age of 76.
What services does Katherine Janet Ziesing bill to Medicare?
In 2024, Katherine Ziesing's most billed Medicare services were injected or infused drug (J7318), injected or infused drug (J7329) and injected or infused drug (J1010).
What drugs does Katherine Janet Ziesing prescribe most?
In 2024 Medicare Part D data, Katherine Ziesing's most prescribed drugs by claims were Amoxicillin, Hydrocodone-Acetaminophen and Oxycodone HCl.
Has Katherine Janet Ziesing received payments from drug or device companies?
CMS Open Payments shows $52 in general payments to Katherine Ziesing from 2 companies from 2025 to 2025. The largest total came from Bioventus LLC.
How long has Katherine Janet Ziesing been practicing?
Katherine Ziesing graduated from medical school in 2018, 8 years ago.
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