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Edit this profileAt a glance
- 515 Spruce St, San Francisco, CA 94118
About Dr. Koo
John Y. Koo, MD is a healthcare provider in San Francisco, CA specializing in dermatology. John trained at Harvard Medical School, graduating in 1981. John is also listed as specializing in psychiatry. According to Medicare claims data, John cared for 28 Medicare patients across 48 services. The services billed most often include established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more and established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more. This provider record is associated with NPI 1245289594.
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) 476-4701
- Email not available
Practice Locations
515 SPRUCE ST
San Francisco, CA 94118
Conditions Commonly Evaluated or Treated
Within Dermatology 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
Acne and follicular disorders
Eczema and inflammatory skin disease
Infections and infestations
Pigment, growths, and benign lesions
Skin cancer
Urticaria, itch, and vascular
Autoimmune and connective tissue
Infections
Rashes & allergy
Skin growths
Procedures & services
Most searched procedures
Diagnostic procedures
Lesion treatment
- Complex skin lesion excision
- Cryotherapy for skin lesions
- Electrodesiccation and curettage
- Incision and drainage of an abscess
Medical dermatology treatment
Cosmetic
Cosmetic and minor surgery
Cosmetic dermatology
Diagnostic
General dermatology
Infections
Medical dermatology
Nails & hair
Skin cancer surgery
Skin growths
Procedures Most Often Billed to Medicare
48 services · 28 patients · 2 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
32 | Less often than most peers in Dermatology |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
16 | Less often than most peers in Dermatology |
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 dermatologists at this location 2
Same specialty, same street address — most likely the same department or group.
Other dermatologists in San Francisco 8
Same specialty, same city.
Trained at Harvard Medical School 8
Other providers in the same specialty who trained at the same institution.
More connections — 8 related providers in 1 group
Class of 1981 at Harvard Medical School 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Dr. Koo specialize in?
Dr. Koo is a dermatologist (skin doctor) in San Francisco, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Dermatology”.
NPI registry
Where is Dr. Koo located?
Dr. Koo is listed at 515 Spruce St, San Francisco, CA 94118. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Koo's phone number?
The number on file is (415) 476-4701. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Koo's NPI number?
Dr. Koo's National Provider Identifier is 1245289594. 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. Koo go to medical school?
Dr. Koo attended Harvard Medical School, graduating in 1981. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Koo been practicing?
Dr. Koo has 45 years experience. Calculated from a graduation year of 1981, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Koo do most often?
According to Medicare billing data, Dr. Koo 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. Koo confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Koo. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.