Physician Profile
Unclaimed ProfileAbout AHN
Ji Won Ahn, MD is a healthcare provider in Walnut Creek, CA specializing in dermatology. Ji Won trained at Washington University School of Medicine, graduating in 2016. Medicare claims data shows Ji Won provided 244 services to 133 patients.
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
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (925) 817-5678
- Email not available
Practice Locations
320 LENNON LN DEPT OF
Walnut Creek, CA 94598
Procedures Most Often Billed to Medicare
244 services · 133 patients · 7 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Destruction of precancer skin growth, 2-14 growths | Procedure | 17003 |
78 |
| Biopsy of related skin growth, first growth | Procedure | 11102 |
33 |
| Destruction of precancer skin growth, 1 growth | Procedure | 17000 |
30 |
| Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks | Procedure | 17311 |
25 |
| Biopsy of related skin growth, each additional growth | Procedure | 11103 |
23 |
| Intermediate repair of wound of scalp, underarms, trunk, arms, or legs, 2.6-7.5 cm | Procedure | 12032 |
18 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
37 |
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 dermatology specialists at this location 4
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 dermatology specialists in Walnut Creek 4
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Washington University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2016 at Washington University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Destruction of precancer skin growth, 2-14 growths 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Dr. Ahn specialize in?
Dr. Ahn is a dermatology in Walnut Creek, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “DERMATOLOGY”.
NPI registry
Where is Dr. Ahn located?
Dr. Ahn is listed at 320 LENNON LN DEPT OF, Walnut Creek, CA 94598. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Ahn's phone number?
The number on file is (925) 817-5678. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Ahn?
Dr. Ahn's National Provider Identifier is 1023460243. 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. Ahn go to medical school?
Dr. Ahn attended Washington University School of Medicine, graduating in 2016. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Ahn have?
Dr. Ahn has 10 years experience. Calculated from a graduation year of 2016, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Ahn do most often?
According to Medicare billing data, Dr. Ahn performs procedures including destruction of precancer skin growth, 2-14 growths, biopsy of related skin growth, first growth and destruction of precancer skin growth, 1 growth, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Ahn's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Ahn. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.