Karen Wu, M.D.
NPI 1245441310 · Dermatopathology (Pathology) Physician · Portsmouth, NH
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Wu, M.D. is a Dermatopathology (Pathology) Physician provider in Portsmouth, NH (NPI 1245441310).
Provider details
- NPI number
- 1245441310
- Entity type
- Individual
- Primary specialty
- Dermatopathology (Pathology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- MD438668 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
5,524 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) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 5,174 | $72 |
| Special Stained Specimen Slides to Identify Organisms Including Interpretation and Report88312 | 163 | $113 |
| Pathology Examination of Tissue Using a Microscope, Moderately Low Complexity88304 | 149 | $43 |
| Special Stained Specimen Slides to Examine Tissue, Initial Procedure88342 | 23 | $33 |
| Pathology Examination of Tissue Using a Microscope, Limited Examination88300 | 15 | $16 |
Typical Medicare-allowed amounts for these services range $16–$113 (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
- 2007-05-24
- Last updated
- 2024-01-31
- Certified
- 2024-01-31
Frequently asked questions
- What is Karen Wu's NPI number?
- Karen Wu's National Provider Identifier (NPI) is 1245441310, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Wu's specialty?
- Karen Wu is listed in the NPPES registry with a primary specialty of Dermatopathology (Pathology) Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Wu located?
- Karen Wu's practice location on file with NPPES is 111 New Hampshire Ave Ste 3, Portsmouth, NH 03801-2864.
- What is Karen Wu's phone number?
- The practice phone number listed in the NPPES registry for Karen Wu is (603) 988-0951.
- Does Karen Wu accept Medicare?
- Karen Wu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Wu's NPI active?
- Yes — Karen Wu's NPI (1245441310) is active in the NPPES registry as of the last update on 2024-01-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.