1. Home
  2. Directory
  3. California
  4. Walnut Creek
  5. Dermatology
  6. NPI Profile

JI WON AHN MD
NPI 1023460243
Dermatology - MOHS-Micrographic Surgery in Walnut Creek, CA

Active since July 12, 2016PECOS EnrolledAccepts Medicare Assignment
77.5/100
CMS Quality Rating
320 LENNON LN DEPT OF, WALNUT CREEK, CA 94598(925) 817-5678 Get Directions Write a Review

NPPES record last updated: October 30, 2024. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Nov 5, 2021, Sep 20, 2021, Aug 5, 2020 and 3 more (6 updates tracked since 2016).

About Ji Won Ahn Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JI WON AHN MD (NPI 1023460243) is an individual mohs-micrographic surgery provider in Walnut Creek, California, licensed in Minnesota (66941) and active in the NPI registry since July 2016. She is enrolled in Medicare PECOS and is a graduate of Washington University School Of Medicine (2016).

NPPES Registry Identity

NPI1023460243
Entity TypeIndividualFemale
Primary Taxonomy207ND0101X
Provider Legal NameJI WON AHNCredential: MD
Location Address320 LENNON LN DEPT OFWalnut Creek, CA 94598-2419
Mailing Address200 1st St SwRochester, MN 55905-0001 · (507) 284-2511
Phone(925) 817-5678
Sole ProprietorNo
Medical School CMSWashington University School Of MedicineGraduated 2016
Enumeration DateJuly 12, 2016
Last NPPES UpdateOctober 30, 20246 updates tracked since enumeration
NPPES CertifiedOctober 30, 2024
✔ NPI 1023460243 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDermatology · MOHS-Micrographic SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207ND0101X
License✔ Licensed in MN · 66941
Definition
The highly-trained surgeons that perform Mohs Micrographic Surgery are specialists both in dermatology and pathology. With their extensive knowledge of the skin and unique pathological skills, they are able to remove only diseased tissue, preserving healthy tissue and minimizing the cosmetic impact of the surgery. Mohs surgeons who belong to the American College of Mohs Surgery (ACMS) have completed a minimum of one year of fellowship training at one of the ACMS-approved training centers in the U.S.
320 LENNON LN DEPT OF, Walnut Creek, CA 94598
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Ji Won Ahn Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2466748579
PECOS Enrollment IDI20241029002314
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Destruction of precancer skin growth, 2-14 growths 17003
This procedure involves removing 2-14 precancerous skin growths. The growths are treated to prevent them from potentially developing into skin cancer. The process is safe, with minimal discomfort, and promotes healthier skin.
78 services16 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
37 services26 patients
Biopsy of related skin growth, first growth 11102
A biopsy of a skin growth involves taking a small sample of the growth to examine it under a microscope. This helps determine if the growth is harmful. The procedure is typically quick, with minimal discomfort. It's a crucial step in ensuring your skin's health.
33 services21 patients
Destruction of precancer skin growth, 1 growth 17000
"Destruction of precancer skin growth" is a procedure that eliminates a single precancerous skin growth. This is done to prevent it from developing into skin cancer. The growth may be removed using various methods such as cryotherapy (freezing), laser therapy, or topical medications.
30 services18 patients
Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks 17311
This procedure involves the careful removal of a growth from the head, neck, hands, or feet. The removed tissue, divided into 1-5 blocks, is then examined under a microscope to study its characteristics and determine the nature of the growth.
25 services23 patients
Biopsy of related skin growth, each additional growth 11103
A biopsy of related skin growth is a procedure where a small piece of skin growth is removed for testing. If additional growths are identified, they may also be biopsied. This helps in diagnosing skin conditions and planning appropriate treatment.
23 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94598 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

77.5/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality68.61
Promoting Interoperability100
Improvement Activities40
Cost56.4

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ji Won Ahn's NPI number?

The NPI number for Ji Won Ahn is 1023460243. It was assigned to this individual provider in the NPPES registry on July 12, 2016.

Where is Ji Won Ahn located?

Ji Won Ahn practices at 320 Lennon Ln Dept Of, Walnut Creek, CA 94598. The listed phone number is (925) 817-5678.

What is Ji Won Ahn's specialty?

The primary specialty registered for this NPI is Dermatology, specializing in MOHS-Micrographic Surgery, with taxonomy code 207ND0101X.

Is Ji Won Ahn enrolled in Medicare?

Yes. Ji Won Ahn is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Ji Won Ahn was last updated on October 30, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.