Physician Profile
William D. Cahill, MD
Unclaimed ProfileAbout Dr. Cahill
William D. Cahill, MD practices internal medicine in San Francisco, CA. William is a 2003 graduate of University of California, San Francisco School of Medicine. According to Medicare claims data, William cared for 248 Medicare patients across 744 services. The services billed most often include subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes, subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes, and initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (415) 554-2727
- Email not available
Practice Locations
50 LECH WALESA
San Francisco, CA 94102
Conditions Commonly Evaluated or Treated
Within Internal Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Infectious disease
Kidney and urinary
Respiratory
Blood & Circulation
Blood disorders
Brain & Nerves
Brain and nerves
Cardiac and vascular
Digestive
Heart & Circulation
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Most searched procedures
Preventive and evaluation
Screening and diagnostic testing
Bones & Joints
Brain and nerves
Cancer screening
Digestive
Exams & Consultations
Heart & Circulation
Heart health
Imaging referral
Immunizations
Lab tests
Lungs & Breathing
Metabolic & Weight
Minor procedures
Office procedures
Office Procedures
Pain management
Preventive & Routine Care
Screenings & Diagnostics
Sexual health
Procedures Most Often Billed to Medicare
744 services · 248 patients · 6 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
427 | More often than most peers in Internal Medicine |
| Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | Office visit | 99309 |
214 | As often as other peers in Internal Medicine |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
41 | As often as other peers in Internal Medicine |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
25 | Less often than most peers in Internal Medicine |
| Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more | Office visit | 99306 |
23 | Less often than most peers in Internal Medicine |
| Nursing facility discharge management, more than 30 minutes | Office visit | 99316 |
14 | Less often than most peers in Internal Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internists at this location 5
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 7
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 3 groups
Other internists in San Francisco 8
Same specialty, same city.
Trained at University of California, San Francisco School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2003 at University of California, San Francisco School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Dr. Cahill's specialty?
Dr. Cahill is an internist in San Francisco, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
Where can I find Dr. Cahill?
Dr. Cahill is listed at 50 Lech Walesa, San Francisco, CA 94102. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Cahill?
The number on file is (415) 554-2727. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Cahill's NPI number?
Dr. Cahill's National Provider Identifier is 1366461048. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Cahill's medical education?
Dr. Cahill attended University of California, San Francisco School of Medicine, graduating in 2003. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Cahill been practicing?
Dr. Cahill has 23 years experience. Calculated from a graduation year of 2003, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Cahill known for?
According to Medicare billing data, Dr. Cahill the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Cahill confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Cahill. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.