Physician Profile
Tammy T. Chang, M.D., PhD
Unclaimed ProfileAbout Dr. Chang
Tammy T. Chang, M.D., PhD practices surgery in San Francisco, CA. Tammy is a 2003 graduate of Harvard Medical School. According to Medicare claims data, Tammy cared for 84 Medicare patients across 84 services. The services billed most often include insertion of central venous tube with port (5 years or older), fluoroscopic guidance for insertion or removal of central vein access device, and ultrasonic guidance for blood vessel access.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
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) 476-1239
- Email not available
Practice Locations
513 PARNASSUS AVE S321
San Francisco, CA 94143
Conditions Commonly Evaluated or Treated
Within Surgery (Unspecified) 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
Breast conditions
Cancer
- Colon cancer
- Esophageal cancer
- Liver cancer
- Neuroendocrine Tumors
- Pancreatic cancer
- Soft-tissue sarcoma
- Stomach cancer
- Thyroid cancer
Colorectal
Digestive
- Abdominal adhesions
- Acid reflux
- Acute pancreatitis
- Bowel obstruction
- Colon polyps
- Diverticulitis
- Gastroparesis
- Peptic ulcer disease
Digestive & blood
Digestive health
- Crohn's disease
- Fecal incontinence
- Perforated bowel
- Severe chronic constipation
- Swallowing difficulties
- Ulcerative colitis
Endocrine
Infections
Lumps & bumps
Lymphatic
Minor surgery
Skin & scars
Skin & soft tissue
Skin cancer
Vascular
Weight & metabolism
Wound care
Wounds
Procedures & services
Most searched procedures
Abdominal
Abdominal surgery
Bariatric
Breast surgery
Cancer
Cancer surgery
Colorectal
- Anal fistula surgery
- Anal Sphincter Repair
- Colon resection
- Hemorrhoid removal
- Ostomy reversal
- Ostomy surgery
- Rectal prolapse repair
- Surgery for chronic anal fissure
Consultations
Diagnostic
Digestive
Digestive health
Endocrine
Infections
Minor surgery
Post-op care
Reconstruction
Skin & soft tissue
- Cyst Removal
- Lipoma removal
- Mole removal
- Pilonidal cyst surgery
- Scar revision surgery
- Skin Tag Removal
Skin cancer
Vascular
Vascular & cancer
Weight loss
Wound care
Wounds
Procedures Most Often Billed to Medicare
84 services · 84 patients · 4 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of central venous tube with port (5 years or older) | Procedure | 36561 |
23 | More often than most peers in Surgery |
| Fluoroscopic guidance for insertion or removal of central vein access device | Imaging | 77001 |
22 | More often than most peers in Surgery |
| Ultrasonic guidance for blood vessel access | Imaging | 76937 |
21 | As often as other peers in Surgery |
| Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes | Treatment | 99152 |
18 | Less often than most peers in Surgery |
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 general surgeons at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
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 — 30 related providers in 4 groups
Other general surgeons in San Francisco 7
Same specialty, same city.
Trained at Harvard Medical School 7
Other providers in the same specialty who trained at the same institution.
Class of 2003 at Harvard Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of central venous tube with port (5 years or older) 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is Tammy T. Chang, M.D.?
Tammy T. Chang, M.D. is a general surgeon in San Francisco, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Surgery”.
NPI registry
What is Tammy T. Chang, M.D.'s address?
Tammy T. Chang, M.D. is listed at 513 Parnassus Ave S321, San Francisco, CA 94143. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Tammy T. Chang, M.D.?
The number on file is (415) 476-1239. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Tammy T. Chang, M.D.'s NPI number?
Tammy T. Chang, M.D.'s National Provider Identifier is 1972787174. 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 Tammy T. Chang, M.D. train?
Tammy T. Chang, M.D. attended Harvard Medical School, graduating in 2003. This comes from the CMS National Downloadable File.
CMS public data
How long has Tammy T. Chang, M.D. been practicing?
Tammy T. Chang, M.D. has 23 years experience. Calculated from a graduation year of 2003, reported in the CMS National Downloadable File.
CMS public data
What procedures does Tammy T. Chang, M.D. perform?
According to Medicare billing data, Tammy T. Chang, M.D. performs procedures including insertion of central venous tube with port; reads or performs imaging such as fluoroscopic guidance for insertion or removal of central vein access device and ultrasonic guidance for blood vessel access; provides treatments such as use of a drug to induce depression of consciousness by physician performing a procedure , initial 15 minutes. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Tammy T. Chang, M.D. confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Tammy T. Chang, M.D.. 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.