Kenneth Blumenfeld, M.D.
NPI 1235158254 · Specialist · San Jose, CA
Enrolled with Medicare as Practitioner - Neurosurgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kenneth Blumenfeld, M.D. is a Specialist provider in San Jose, CA (NPI 1235158254).
Provider details
- NPI number
- 1235158254
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A50900 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
392 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) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 119 | $199 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 113 | $155 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 45 | $89 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 33 | $213 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 24 | $195 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,232 across 13 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
Registry dates
- Enumerated
- 2006-07-19
- Last updated
- 2012-08-21
Frequently asked questions
- What is Kenneth Blumenfeld's NPI number?
- Kenneth Blumenfeld's National Provider Identifier (NPI) is 1235158254, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kenneth Blumenfeld's specialty?
- Kenneth Blumenfeld is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Kenneth Blumenfeld located?
- Kenneth Blumenfeld's practice location on file with NPPES is 2577 Samaritan Dr, San Jose, CA 95124-4100.
- What is Kenneth Blumenfeld's phone number?
- The practice phone number listed in the NPPES registry for Kenneth Blumenfeld is (408) 358-0133.
- Does Kenneth Blumenfeld accept Medicare?
- Kenneth Blumenfeld is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kenneth Blumenfeld's NPI active?
- Yes — Kenneth Blumenfeld's NPI (1235158254) is active in the NPPES registry as of the last update on 2012-08-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.