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Edit this profileWhere to find Rena D. Callahan, M.D.
- Valencia location main office
27235 Tourney Rd Ste 2400, Valencia, CA 91355 - Santa Monica location
2336 Santa Monica Blvd Ste 315, Santa Monica, CA 90404 - Santa Monica location
2020 Santa Monica Blvd Ste 230, Santa Monica, CA 90404
About Dr. Callahan
Based in Valencia, CA, Rena D. Callahan, M.D. is listed in the NPI registry under internal medicine. Rena graduated from Perelman School of Med at the University of Pennsylvania in 2004. Rena is also listed as specializing in hematology, medical oncology, and surgery of the hand. Medicare claims data shows Rena provided 24,670 services to 1,763 patients. The services billed most often include injection, denosumab, 1 mg, injection, fosaprepitant, 1 mg, and injection, fulvestrant (fresenius kabi) not therapeutically equivalent to j9395, 25 mg. NPI 1487856779 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (661) 255-5350
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
27235 TOURNEY RD STE 2400
Valencia, CA 91355
2336 Santa Monica Blvd Ste 315
Santa Monica, CA 90404
2020 Santa Monica Blvd Ste 230
Santa Monica, CA 90404
Conditions Commonly Evaluated or Treated
Within Internal Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Cancer Prevention
Cancer risk
Environmental health
- Asbestos Exposure
- Contaminated drinking water exposure
- Heat exhaustion and heat stroke
- Radon gas exposure
- Tick bite and Lyme disease risk
- Toxic Mold Exposure
- Wildfire smoke and air pollution exposure
- Workplace Chemical Exposure
General wellness
Heart health
Infectious Disease
Infectious disease
Kidney health
Lifestyle & wellness
Lifestyle health
Longevity
Metabolic & Lifestyle
Occupational health
Occupational Health
Rashes & allergy
Sexual Health
Sexual health
Substance use
Travel health
Wellness and energy
Workplace health
Most searched conditions
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Kidney and urinary
Respiratory
Blood & Circulation
Blood disorders
Brain & Nerves
Brain and nerves
Cardiac and vascular
Digestive
Heart & Circulation
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Addiction & habits
Cancer screening
Cancer Screening
Checkups & exams
Chronic illness
Diagnostics & screening
Environmental health
Fitness & body composition
Heart & Circulation
Heart & circulation
Heart health
Hospital-based procedures
Imaging referral
Immunizations
Infection & Microbiology Tests
- STI and STD Screening
- H. Pylori Breath Test
Lifestyle & Prevention
Longevity
Lower endoscopy
Lungs & Breathing
Metabolic & Weight
Metabolic health
Occupational health
Occupational Health
Office Procedures
Preventive and evaluation
- Preoperative medical clearance
- Medication management
- Post-hospital transitional care
Preventive imaging
Preventive screening
Routine Blood Tests
Screening & labs
Screening and diagnostic testing
- Blood pressure screening
- Cancer screening and prevention planning
- Diabetes and prediabetes screening
- EKG
- Spirometry
Screenings & Diagnostics
Travel Health
Travel medicine
Wellness
Wellness & Screening
Workplace health
Skin growths
Sleep
Most searched procedures
Bones & Joints
Brain and nerves
Digestive
- Endoscopy
Exams & Consultations
Lab tests
Minor procedures
- Ingrown toenail removal
- Suture removal
Office procedures
Pain management
Preventive & Routine Care
Sexual health
Procedures Most Often Billed to Medicare
24,670 services · 1,763 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
233 | More often than most peers in Internal Medicine |
| Administration of hormonal anti-neoplastic chemotherapy under skin or into muscle | Treatment | 96402 |
297 | Too few peers to compare |
| Injection of additional new drug or substance into vein | Treatment | 96375 |
286 | More often than most peers in Internal Medicine |
| Administration of chemotherapy into vein, 1 hour or less | Treatment | 96413 |
226 | More often than most peers in Internal Medicine |
| Infusion into a vein for therapy, prevention, or diagnosis, additional sequential infusion, 1 hour or less | Treatment | 96367 |
141 | As often as other peers in Internal Medicine |
| Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less | Treatment | 96365 |
124 | More often than most peers in Internal Medicine |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
114 | More often than most peers in Internal Medicine |
| Infusion into a vein for therapy, prevention, or diagnosis, each additional hour | Treatment | 96366 |
75 | Less often than most peers in Internal Medicine |
| Administration of additional new drug or substance into vein, 1 hour or less | Treatment | 96417 |
72 | As often as other peers in Internal Medicine |
| Injection, denosumab, 1 mg | Drug given | J0897 |
7,860 | More than most peers in Internal Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internists at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 31 related providers in 4 groups
Other internists in Valencia 7
Same specialty, same city.
Trained at Perelman School of Med at the University of Pennsylvania 8
Other providers in the same specialty who trained at the same institution.
Class of 2004 at Perelman School of Med at the University of Pennsylvania 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is Rena D. Callahan?
Rena D. Callahan is an internist in Valencia, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
What is Rena D. Callahan's address?
Rena D. Callahan is listed at 27235 Tourney Rd Ste 2400, Valencia, CA 91355. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Rena D. Callahan?
The number on file is (661) 255-5350. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Rena D. Callahan?
Rena D. Callahan's National Provider Identifier is 1487856779. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Rena D. Callahan train?
Rena D. Callahan attended Perelman School of Med at the University of Pennsylvania, graduating in 2004. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Rena D. Callahan have?
Rena D. Callahan has 22 years experience. Calculated from a graduation year of 2004, reported in the CMS National Downloadable File.
CMS public data
What procedures does Rena D. Callahan perform?
According to Medicare billing data, Rena D. Callahan performs procedures including insertion of needle into vein for collection of blood sample; provides treatments such as administration of hormonal anti-neoplastic chemotherapy under skin or into muscle and injection of additional new drug or substance into vein, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Rena D. Callahan's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Rena D. Callahan. If this is you, claiming it is free.
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