Rena Callahan, M.D.
NPI 1487856779 · Internal Medicine Physician · Valencia, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rena Callahan, M.D. is a Internal Medicine Physician provider in Valencia, CA (NPI 1487856779).
Provider details
- NPI number
- 1487856779
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A94238 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
19 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
4,311 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,121 | $138 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 827 | $17 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 431 | $8 |
| Administration of Hormonal Anti-Neoplastic Chemotherapy Under Skin Or Into Muscle96402 | 297 | $40 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 286 | $17 |
| Insertion of Needle Into Vein for Collection of Blood Sample |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$96,801 across 92 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)
- 2336 Santa Monica Blvd Ste 315Santa Monica, CA 90404-2095Phone: (310) 829-5471Fax: (310) 829-6192
- 2020 Santa Monica Blvd Ste 230Santa Monica, CA 90404-2124Phone: (310) 829-5471Fax: (310) 582-6294
Registry dates
- Enumerated
- 2007-05-31
- Last updated
- 2020-01-23
- Certified
- 2020-01-23
Frequently asked questions
- What is Rena Callahan's NPI number?
- Rena Callahan's National Provider Identifier (NPI) is 1487856779, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rena Callahan's specialty?
- Rena Callahan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Rena Callahan located?
- Rena Callahan's practice location on file with NPPES is 27235 Tourney Rd Ste 2400, Valencia, CA 91355-5905.
- What is Rena Callahan's phone number?
- The practice phone number listed in the NPPES registry for Rena Callahan is (661) 255-5350.
- Does Rena Callahan accept Medicare?
- Rena Callahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rena Callahan's NPI active?
- Yes — Rena Callahan's NPI (1487856779) is active in the NPPES registry as of the last update on 2020-01-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.