Katharine Hollnagel, M.D.
NPI 1295180289 · Orthopaedic Surgery Physician · Boston, MA
Enrolled with Medicare as Practitioner - Orthopedic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katharine Hollnagel, M.D. is a Orthopaedic Surgery Physician provider in Boston, MA (NPI 1295180289).
Provider details
- NPI number
- 1295180289
- Entity type
- Individual
- Primary specialty
- Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A172578 (CA)
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 tenure33% of score
10 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$76 across 1 record (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 (1)
- 3030 Childrens WaySan Diego, CA 92123-4232Phone: (858) 966-6789
Registry dates
- Enumerated
- 2016-04-27
- Last updated
- 2022-09-20
- Certified
- 2022-09-20
Frequently asked questions
- What is Katharine Hollnagel's NPI number?
- Katharine Hollnagel's National Provider Identifier (NPI) is 1295180289, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katharine Hollnagel's specialty?
- Katharine Hollnagel is listed in the NPPES registry with a primary specialty of Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Katharine Hollnagel located?
- Katharine Hollnagel's practice location on file with NPPES is 300 Longwood Ave, Boston, MA 02115-5724.
- What is Katharine Hollnagel's phone number?
- The practice phone number listed in the NPPES registry for Katharine Hollnagel is (617) 355-6000.
- Does Katharine Hollnagel accept Medicare?
- Katharine Hollnagel is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katharine Hollnagel's NPI active?
- Yes — Katharine Hollnagel's NPI (1295180289) is active in the NPPES registry as of the last update on 2022-09-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.