Dr. Frederick William Penczak, MD
- Medicare services, 2024
- 275
- Medicare patients, 2024
- 358
- Hospital affiliations
- 2
- Industry payments
- $327
- Medical group
- 1
- Practice address
- 1635 Divisadero Street, Suite 200, San Francisco, CA 94115
- Practice phone
- Call (415) 346-4548
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Presidio Surgery Center
Surgery Center - Medicare-Certified · San Francisco, California
Find Dr. Penczak'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. Frederick William Penczak is a general surgeon in San Francisco, California
Dr. Penczak practices at Presidio Surgery Center in San Francisco, California.
Dr. Penczak's NPI, 1841379070, was assigned on November 6, 2006. Dr. Penczak graduated from MCP-Hahnemann College of Medicine in 1999. Dr. Penczak holds California license 00A685120.
- NPI
- 1841379070NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9830185339
- NPI enumeration date
- November 6, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (415) 346-4548
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Frederick William Penczak practices at Presidio Surgery Center in San Francisco, California
Dr. Penczak's primary practice is Presidio Surgery Center, at 1635 Divisadero Street, Suite 200, San Francisco, CA 94115. The practice phone is (415) 346-4548.
- Presidio Surgery Center1635 Divisadero Street, Suite 200, San Francisco, CA 94115Phone(415) 346-4548
Source: Dmand AI Affiliation Data
Dr. Frederick William Penczak is affiliated with 3 sites of care and 1 medical group
Dr. Penczak's primary practice is Presidio Surgery Center in San Francisco, California. Dr. Penczak is also affiliated with Novato Community Hospital. The medical group on file is Sutter Santa Rosa Regional Hospital. Dmand AI also links Dr. Penczak to 1 more hospital, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Frederick William Penczak's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Penczak practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Presidio Surgery Center | 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. Frederick William Penczak is one of 2,926 general surgeons in California
Surgery is Dr. Penczak's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Penczak is licensed in California.
Specialties and state licenses
- Surgery, CaliforniaPrimary
General surgeons near Dr. Penczak
Counts of general 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. Frederick William Penczak billed Medicare for 275 services in 2024
CMS data shows 275 Medicare services from Dr. Penczak across 4 procedure codes in 2024, for 358 Medicare patients. Medicare paid $50,452 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Penczak's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 2302024: 27520%
Dr. Penczak compared with the California median for general surgeons, 2024
- Dr. Penczak
- California median
- Medicare services
- 275vs 16666% above
- Medicare patients
- 358vs 1213.0 times
Medians across 2,606 general surgeons in California with Dmand AI profiles that report each measure.
Dr. Penczak'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. Penczak and other general surgeons in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Frederick William Penczak treated 358 Medicare patients in 2024, average age 76
CMS counts 358 Medicare patients who saw Dr. Penczak in 2024. The largest group is 65 to 74, with 159 patients. 75% of them have arthritis, and 75% have high cholesterol. 6% are also on Medicaid. Their average risk score is 0.93, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Penczak's median patient age at 63, with 46% women.
Dr. Penczak's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Penczak's Medicare patients by sex, 2024
- Women23165%
- Men12735%
Chronic conditions among Dr. Penczak's Medicare patients, 2024
- Arthritis75%
- High cholesterol75%
- High blood pressure66%
- Mood disorders32%
- Anxiety28%
- Depression28%
- Ischemic heart disease27%
- Osteoporosis23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Penczak's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women46%
- Men52%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Frederick William Penczak ranks in the 98th percentile for hip replacement in Medicare
Dr. Penczak accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 125 procedures of hip replacement by Dr. Penczak, more than 98% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Penczak ranks in Medicare procedure volume
- Hip replacement
- 98th percentile125 procedures
- Knee replacement
- 92nd percentile91 procedures
- Spinal fusion
- 49th percentile37 procedures
- Laminectomy or laminotomy (partial removal of spine bones)
- 45th percentile17 procedures
- Upper limb (arm) arthroscopy (minimally invasive joint repair)
- 53rd percentile14 procedures
- Lower limb (leg) arthroscopy (minimally invasive joint repair)
- 85th percentile13 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Frederick William Penczak received $327 in industry payments in 2025
CMS Open Payments shows 8 general payments to Dr. Penczak from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Stryker Corporation paid the most, $327.
Companies that paid Dr. Penczak the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Frederick William Penczak graduated from MCP-Hahnemann College of Medicine
Dr. Penczak graduated from MCP-Hahnemann College of Medicine in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Frederick William Penczak accepts plans from 2 insurance carriers
Dr. Penczak is in network with 2 carriers, including CMS Medicare and Humana. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
- Humana
Plan types Dr. Penczak accepts, by number of carriers
- HMO1
- Medicare1
Source: Dmand AI Insurance Network Data
Sources for Dr. Frederick William Penczak'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) |
| 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) |
| 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. Frederick William Penczak
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. Frederick William Penczak's NPI number?
Dr. Frederick William Penczak's NPI number is 1841379070. It was assigned on November 6, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Frederick William Penczak?
Dr. Frederick William Penczak is a general surgeon in San Francisco, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Frederick William Penczak practice?
Dr. Penczak practices at 1635 Divisadero Street, Suite 200, San Francisco, CA 94115. Dr. Penczak's primary practice is Presidio Surgery Center in San Francisco, California. Dmand AI also links Dr. Penczak to 1 hospital.
What is Dr. Frederick William Penczak's office phone number?
The practice phone on file for Dr. Penczak is (415) 346-4548.
What is Dr. Frederick William Penczak's medical license number?
Dr. Penczak holds California license 00A685120.
Which hospitals is Dr. Frederick William Penczak affiliated with?
Dr. Penczak is affiliated with Novato Community Hospital. Dmand AI links Dr. Penczak to 1 more hospital.
What medical group is Dr. Frederick William Penczak part of?
Dr. Penczak is linked to Sutter Santa Rosa Regional Hospital.
Does Dr. Frederick William Penczak accept Medicare?
Yes. CMS data shows Dr. Penczak billed Medicare for 275 services in 2024, and Dr. Penczak accepts Medicare assignment.
How many Medicare patients does Dr. Frederick William Penczak see?
CMS counts 358 Medicare patients who saw Dr. Penczak in 2024, with an average age of 76.
What services does Dr. Frederick William Penczak bill to Medicare?
In 2024, Dr. Penczak's most billed Medicare services were surgery: bones and joints (27130), surgery: bones and joints (27447) and surgery: bones and joints (27236).
Show 4 more questionsShow fewer questions
Where did Dr. Frederick William Penczak go to medical school?
Dr. Penczak graduated from MCP-Hahnemann College of Medicine in 1999.
Has Dr. Frederick William Penczak received payments from drug or device companies?
CMS Open Payments shows $327 in general payments to Dr. Penczak from 1 company from 2025 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Frederick William Penczak been practicing?
Dr. Penczak graduated from medical school in 1999, 27 years ago.
What insurance does Dr. Frederick William Penczak accept?
Dr. Penczak is in network with 2 carriers, including CMS Medicare and Humana. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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