William Ko, M.D.
NPI 1841230976 · Dermatology Physician · Phoenix, AZ
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Ko, M.D. is a Dermatology Physician provider in Phoenix, AZ (NPI 1841230976).
Provider details
- NPI number
- 1841230976
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 26333 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
9,750 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 4,467 | $6 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 1,068 | $88 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 1,065 | $45 |
| Biopsy of Related Skin Growth, Each Additional Growth11103 | 678 | $48 |
| Biopsy of Related Skin Growth, First Growth11102 | 660 | $92 |
| Removal and Microscopic Exam of Growth of Head, Neck, Hands, Feet, Or Genitals, 1-5 Tissue Blocks |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Mupirocin | 484 | 361 |
| Ketoconazole | 115 | 60 |
| Valacyclovir Hclbrand: Valacyclovir | 84 | 65 |
| Fluticasone Propionate | 79 | 65 |
| Imiquimod | 67 | 42 |
| Triamcinolone Acetonide | 62 | 52 |
| Fluorouracil | 52 | 48 |
| Gentamicin Sulfate | 38 | 32 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,714 across 153 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 2121 W Indian School RdPhoenix, AZ 85015-4908Phone: (602) 277-1449Fax: (602) 277-9984
- 2224 W Northern Ave Ste D300Phoenix, AZ 85021Phone: (602) 277-1449Fax: (602) 277-9984
Registry dates
- Enumerated
- 2006-06-07
- Last updated
- 2018-10-25
Frequently asked questions
- What is William Ko's NPI number?
- William Ko's National Provider Identifier (NPI) is 1841230976, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ko's specialty?
- William Ko is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is William Ko located?
- William Ko's practice location on file with NPPES is 2224 W Northern Ave Ste D300, Phoenix, AZ 85021.
- What is William Ko's phone number?
- The practice phone number listed in the NPPES registry for William Ko is (602) 277-1449.
- Does William Ko accept Medicare?
- William Ko is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Ko's NPI active?
- Yes — William Ko's NPI (1841230976) is active in the NPPES registry as of the last update on 2018-10-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.