William Karlon, M.D.
NPI 1154365088 · Anatomic Pathology & Clinical Pathology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Hematology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Karlon, M.D. is a Anatomic Pathology & Clinical Pathology Physician provider in San Francisco, CA (NPI 1154365088).
Provider details
- NPI number
- 1154365088
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A87881 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
699 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Flow Cytometry Technique for Dna Or Cell Analysis, 16 Or More Markers88189 | 486 | $93 |
| Flow Cytometry Technique for Dna Or Cell Analysis, 9 to 15 Markers88188 | 111 | $69 |
| Molecular Pathology Procedure; Physician Interpretation and ReportG0452 | 79 | $53 |
| Antibody Evaluation, Initial Single Antibody Stain Procedure88346 | 12 | $40 |
| Antibody Evaluation, Each Additional Single Antibody Stain Procedure88350 | 11 | $32 |
Typical Medicare-allowed amounts for these services range $32–$93 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-14
- Last updated
- 2008-06-06
Frequently asked questions
- What is William Karlon's NPI number?
- William Karlon's National Provider Identifier (NPI) is 1154365088, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Karlon's specialty?
- William Karlon is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is William Karlon located?
- William Karlon's practice location on file with NPPES is 185 Berry St, San Francisco, CA 94107-1773.
- What is William Karlon's phone number?
- The practice phone number listed in the NPPES registry for William Karlon is (415) 353-4721.
- Does William Karlon accept Medicare?
- William Karlon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Karlon's NPI active?
- Yes — William Karlon's NPI (1154365088) is active in the NPPES registry as of the last update on 2008-06-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.