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- 400 Parnassus Ave # 336, San Francisco, CA 94143
About Dr. Simmons
Based in San Francisco, CA, William F. Simmons, MD is listed in the NPI registry under infectious disease. William graduated from Columbia University College of Physicians and Surgeons in 2018. Medicare claims data shows William provided 369 services to 254 patients. The services billed most often include subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes, established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more, and initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes. NPI 1326537721 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
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) 353-2626
- Email not available
Practice Locations
400 PARNASSUS AVE # 336
San Francisco, CA 94143
Conditions Commonly Evaluated or Treated
Within Infectious Disease 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
Bacterial infections
- C. diff Infection
- Cat Scratch Fever
- Drug-Resistant Bacterial Infection
- Flesh-Eating Infection
- NTM lung infection
- Recurrent bacterial vaginosis
- Tick-Borne Infection
- Tuberculosis
Bones & joints
Cardiovascular
Digestive infections
Fungal infections
- Aspergillosis mold infection
- Chronic Yeast Infection
- Cryptococcal fungal infection
- Fungal lung infection
- Fungal sinus infection
- Valley fever
General symptoms
Neurological infections
Parasitic infections
Post-infection conditions
Respiratory infections
Sexually transmitted infections
Skin & soft tissue
- Cellulitis
- Diabetic Foot Infection
- Dog or Animal Bite Infection
- Non-Healing Wound Infection
- Post-surgery fever or infection
- Skin and soft-tissue abscess
Travel-related infections
Urinary tract
Viral infections
- Chronic Epstein-Barr virus reactivation
- Cytomegalovirus
- Hepatitis B
- Mononucleosis
- Mpox
- Shingles
- West Nile virus
Procedures & services
Most searched procedures
Allergy & immunology
Allergy & Pharmacology
Antiviral treatments
Consultation & second opinions
- Diabetic Foot Ulcer Debridement Consultation
- Infection Screening Before Biologics
- Post-Travel Illness Workup
- Pre-Chemotherapy Infection Clearance
- Pre-Transplant Infection Screening
- Prosthetic Hardware Infection Evaluation
- Second Opinion on Antibiotic Treatment
Diagnostic evaluations
- Chronic viral fatigue evaluation
- Medical parasite clearance evaluation
- Post-sepsis syndrome evaluation
- Sinus infection culture evaluation
- Unexplained fever workup
Diagnostics & screening
- Blood Culture Workup
- Fungal Blood Testing
- Immune System Workup for Frequent Infections
- Joint injection or aspiration
- Spinal Tap Infection Analysis
- Stool Parasite Testing
- TB Skin Test
- Tuberculosis Blood Test
- Wound Culture and Sensitivity
Gastrointestinal treatments
Infusions & Medications
Lab testing & monitoring
- Comprehensive STI screening panel
- HIV viral load monitoring
- Infectious diarrhea stool pathogen PCR panel
- Mold and environmental fungal testing
- Specialized Lyme disease confirmation testing
- Tropical disease blood work
Medication management
- Atypical Mycobacteria Treatment Plan
- Chronic Hepatitis B Medication Management
- Infected Central Line Removal Coordination
- Malaria Treatment
- Oral Antibiotic Step-Down Therapy
- Recurrent Shingles Suppression
- Syphilis Injections
- Systemic Antifungal Therapy
Prevention & Prophylaxis
Prevention & prophylaxis
- Emergency HIV Prevention (PEP)
- Needlestick Injury Evaluation
- Rabies Post-Exposure Shots
- Tick Bite Evaluation
Travel medicine
Procedures Most Often Billed to Medicare
369 services · 254 patients · 8 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
94 | As often as other peers in Infectious Disease |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
83 | More often than most peers in Infectious Disease |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
46 | As often as other peers in Infectious Disease |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
44 | As often as other peers in Infectious Disease |
| Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient' | Billing code | G2211 |
31 | As often as other peers in Infectious Disease |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
29 | More often than most peers in Infectious Disease |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
26 | Less often than most peers in Infectious Disease |
| Telephone, internet, or electronic health record assessment and management with written report by consulting physician, at least 5 minutes | Office visit | 99451 |
16 | Less often than most peers in Infectious Disease |
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 infectious disease specialists at this location 1
Same specialty, same street address — most likely the same department or group.
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.
Other infectious disease specialists in San Francisco 7
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Columbia University College of Physicians and Surgeons 8
Other providers in the same specialty who trained at the same institution.
Class of 2018 at Columbia University College of Physicians and Surgeons 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Dr. Simmons specialize in?
Dr. Simmons is an infectious disease specialist in San Francisco, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Infectious Disease”.
NPI registry
Where is Dr. Simmons located?
Dr. Simmons is listed at 400 Parnassus Ave # 336, San Francisco, CA 94143. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Simmons's phone number?
The number on file is (415) 353-2626. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Simmons?
Dr. Simmons's National Provider Identifier is 1326537721. 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
Where did Dr. Simmons go to medical school?
Dr. Simmons attended Columbia University College of Physicians and Surgeons, graduating in 2018. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Simmons have?
Dr. Simmons has 8 years experience. Calculated from a graduation year of 2018, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Simmons do most often?
According to Medicare billing data, Dr. Simmons 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
Is Dr. Simmons's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Simmons. If this is you, claiming it is free.
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