Dr. Stefan A. Willging, MD
- Medicare services, 2024
- 4,757
- Medicare patients, 2024
- 447
- Part D claims, 2024
- 9,316
- Publications
- 1
- Hospital affiliations
- 5
- Practice address
- 4060 4th Ave, San Diego, CA 92103
- Practice phone
- Call (619) 299-7467
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Central San Diego Surgery Center Inc.
San Diego, California
Find Dr. Willging'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. Stefan A. Willging is an internist in San Diego, California
Dr. Willging practices at Central San Diego Surgery Center Inc. in San Diego, California.
Dr. Willging's NPI, 1679523518, was assigned on May 11, 2006. Dr. Willging graduated from University of Ulm Faculty of Medicine in 1999. Dr. Willging holds California license A81537.
- NPI
- 1679523518NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1355301334
- NPI enumeration date
- May 11, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (619) 299-7467
- 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 Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Stefan A. Willging practices at Central San Diego Surgery Center Inc. in San Diego, California
Dr. Willging's primary practice is Central San Diego Surgery Center Inc., at 4060 4th Ave, San Diego, CA 92103 in San Diego County. The practice phone is (619) 299-7467.
- Central San Diego Surgery Center Inc.4060 4th Ave, San Diego, CA 92103 · San Diego CountyPhone(619) 299-7467
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Stefan A. Willging is affiliated with 10 sites of care and 1 medical group
Dr. Willging's primary practice is Central San Diego Surgery Center Inc. in San Diego, California. Dr. Willging is also affiliated with Sharp Memorial Hospital. The medical group on file is Hillcrest Internal Medicine. Dmand AI also links Dr. Willging to 4 more hospitals, 3 home health agencies and 1 group practice or clinic, 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 Dr. Stefan A. Willging's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Willging practices, 9 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Central San Diego Surgery Center Inc. | Available with a free account |
| +9 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Stefan A. Willging is one of 16,751 internists in California
Internal medicine is Dr. Willging's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Willging is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Willging's licenses on file in 2 states: California and Iowa.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Iowa license
Clinical focus
Dmand AI lists acid reflux, acute gastroduodenitis, acute sinusitis, acute skin infection, aneurysm, ankle or foot injury, anxiety and arteritis among the conditions Dr. Willging treats.
Internists near Dr. Willging
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. Stefan A. Willging billed Medicare for 4,757 services in 2024
CMS data shows 4,757 Medicare services from Dr. Willging across 22 procedure codes in 2024, for 447 Medicare patients. Medicare paid $238,408 for them. Every service was in an office.
Dr. Willging's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2,0022024: 2,35718%
- Other services
- 2023: 8342024: 1,24449%
- Drugs given in the office
- 2023: 9722024: 77520%
- Surgery
- 2023: 2152024: 1978%
- Tests and treatments
- 2023: 2142024: 18414%
Dr. Willging compared with the California median for internists, 2024
- Dr. Willging
- California median
- Medicare services
- 4,757vs 36113.2 times
- Medicare patients
- 447vs 1513.0 times
- Part D claims
- 8,528vs 42120.3 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Willging'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.
Need commercial claims for Dr. Willging?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Willging and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stefan A. Willging treated 447 Medicare patients in 2024, average age 77
CMS counts 447 Medicare patients who saw Dr. Willging in 2024. The largest group is 75 to 84, with 183 patients. 75% of them have high cholesterol, and 64% have high blood pressure. Their average risk score is 1.07, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Willging's median patient age at 72, with 48% women.
Dr. Willging's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Willging's Medicare patients by sex, 2024
- Women20546%
- Men24254%
Chronic conditions among Dr. Willging's Medicare patients, 2024
- High cholesterol75%
- High blood pressure64%
- Arthritis51%
- Ischemic heart disease25%
- Mood disorders25%
- Cancer22%
- Depression22%
- Osteoporosis22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Willging's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women48%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Stefan A. Willging wrote 9,316 Medicare Part D claims in 2024
In 2024, Dr. Willging wrote 9,316 Medicare Part D claims for 613 patients. 87% of them were for generic drugs. CMS names the drug for 8,528 of them, across 160 drugs with 11 or more claims each, at $875,591 in total drug cost. In 2023, CMS named 7,979 claims across 158 drugs.
Dr. Willging's Part D claims by kind of drug, 2024
- Generic8,081 claims87%
- Brand-name1,211 claims13%
- Other24 claims0%
Dr. Willging'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. Willging's Part D claims, 2024
- Opioids4%415 of 9,316 claims
- Antibiotics4%356 of 9,316 claims
- Antipsychotics, patients 65 and over1%103 of 9,316 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: 7,9792024: 8,5287%
Drugs named by CMS: 160 in 2024, 158 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. Stefan A. Willging offers telehealth to Medicare patients
Dr. Willging accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Willging as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Skin biopsy: 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. Stefan A. Willging has 1 publication on record
Dmand AI links 1 paper to Dr. Willging.
Recent publications by Dr. Willging
See who Dr. Willging researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Willging works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Stefan A. Willging received $23,100 in industry payments from 2016 to 2025
CMS Open Payments shows 1,168 general payments to Dr. Willging from 91 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Abbvie Inc. paid the most, $2,821.
General payments to Dr. Willging by program year, 2016 to 2025
General payments to Dr. Willging by kind, 2016 to 2025
- Food and beverage$22,85799%
- Education$2431%
Companies that paid Dr. Willging the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Stefan A. Willging has 1 award and honors on record
Dmand AI lists 1 award for Dr. Willging, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Willging
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Stefan A. Willging graduated from University of Ulm Faculty of Medicine
Dr. Willging graduated from University of Ulm Faculty of Medicine in 1999.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Stefan A. Willging accepts plans from 15 insurance carriers
Dr. Willging is in network with 15 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- Humana
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- +7 more carriersWith a free account
Plan types Dr. Willging accepts, by number of carriers
- PPO10
- Medicare8
- HMO7
- EPO4
- POS4
Source: Dmand AI Insurance Network Data
Sources for Dr. Stefan A. Willging'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Stefan A. Willging
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. Stefan A. Willging's NPI number?
Dr. Stefan A. Willging's NPI number is 1679523518. It was assigned on May 11, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Stefan A. Willging?
Dr. Stefan A. Willging is an internist in San Diego, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Stefan A. Willging practice?
Dr. Willging practices at 4060 4th Ave, San Diego, CA 92103. Dr. Willging's primary practice is Central San Diego Surgery Center Inc. in San Diego, California. Dmand AI also links Dr. Willging to 4 hospitals, 3 home health agencies and 1 group practice or clinic.
What is Dr. Stefan A. Willging's office phone number?
The practice phone on file for Dr. Willging is (619) 299-7467.
What is Dr. Stefan A. Willging's medical license number?
Dr. Willging holds California license A81537, one of the licenses on file in 2 states.
Which states has Dr. Stefan A. Willging been licensed in?
Dmand AI has state licenses on file for Dr. Willging in California (2003 to 2027) and Iowa (2001 to 2003).
Which hospitals is Dr. Stefan A. Willging affiliated with?
Dr. Willging is affiliated with Sharp Memorial Hospital. Dmand AI links Dr. Willging to 4 more hospitals.
What medical group is Dr. Stefan A. Willging part of?
Dr. Willging is linked to Hillcrest Internal Medicine.
Does Dr. Stefan A. Willging accept Medicare?
Yes. CMS data shows Dr. Willging billed Medicare for 4,757 services in 2024, and Dr. Willging accepts Medicare assignment.
Does Dr. Stefan A. Willging offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Willging as offering telehealth services.
Show 9 more questionsShow fewer questions
How many Medicare patients does Dr. Stefan A. Willging see?
CMS counts 447 Medicare patients who saw Dr. Willging in 2024, with an average age of 77.
Is Dr. Stefan A. Willging board certified?
Yes. Dr. Willging is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Stefan A. Willging bill to Medicare?
In 2024, Dr. Willging's most billed Medicare services were care management and other visits (99490), injected or infused drug (J3301) and office visit, established patient (99213).
Where did Dr. Stefan A. Willging go to medical school?
Dr. Willging graduated from University of Ulm Faculty of Medicine in 1999.
What drugs does Dr. Stefan A. Willging prescribe most?
In 2024 Medicare Part D data, Dr. Willging's most prescribed drugs by claims were Atorvastatin Calcium, Rosuvastatin Calcium and Levothyroxine Sodium.
Has Dr. Stefan A. Willging received payments from drug or device companies?
CMS Open Payments shows $23,100 in general payments to Dr. Willging from 91 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Stefan A. Willging been practicing?
Dr. Willging graduated from medical school in 1999, 27 years ago.
Does Dr. Stefan A. Willging do research?
Dmand AI links 1 publication to Dr. Willging.
What insurance does Dr. Stefan A. Willging accept?
Dr. Willging is in network with 15 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
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