Physician Profile
Rena D. Callahan, M.D.
Unclaimed ProfileAbout 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.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
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
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
Most searched conditions
- Allergies
- Diabetes
- Flu
- Hypothyroidism
- Strep throat
- UTI
Cardiometabolic
- High blood pressure
- High cholesterol
Digestive and liver
- Acid reflux
- Fatty liver disease
- IBS
Endocrine, blood, and bone
- Gout
Infectious disease
- Shingles
Kidney and urinary
- Chronic kidney disease
- Enlarged prostate
Respiratory
- Acute bronchitis
- Asthma
- COPD
Blood & Circulation
- Blood clots
Blood disorders
- Anemia
Brain & Nerves
- Alzheimer's disease
Brain and nerves
- Vertigo
Cardiac and vascular
- AFib
Digestive
- Diverticulitis
Heart & Circulation
- Heart disease
Infections
- Impetigo
Kidney & Bladder
- Overactive Bladder and Leakage
Lungs & Breathing
- Sleep apnea
Mental Health
- Generalized anxiety disorder
- Insomnia and Sleep Problems
Neurologic and behavioral
- Depression
- Migraines
Pain
- Back pain
Rheumatologic and pain
- Osteoarthritis
Procedures & services
Most searched procedures
- Annual physical
- Blood test
- Flu shot
- Medicare wellness visit
- Sick visit
- TB test
- Well-woman exam
Preventive and evaluation
- Medication management
- Post-hospital transitional care
Screening and diagnostic testing
- EKG
- Spirometry
Bones & Joints
- Trigger Point Injections
Brain and nerves
- Epley Maneuver
Cancer screening
- Colon Cancer Screening Referral
- Mammogram Referral
Digestive
- Endoscopy
Exams & Consultations
- Pre-Op Clearance Exam
Heart & Circulation
- Blood Pressure Check
- Heart monitor
Heart health
- Cardiac Stress Test Referral
Imaging referral
- Abdominal Ultrasound Referral
Immunizations
- Tetanus shot
Lab tests
- Urinalysis
Lungs & Breathing
- At-Home Sleep Study Order
Metabolic & Weight
- Weight Loss Injections and Medication
Minor procedures
- Ingrown toenail removal
- Suture removal
Office procedures
- Cryotherapy for skin lesions
- Earwax removal
- Incision and drainage of an abscess
- Skin biopsy
Office Procedures
- Skin Tag and Mole Removal
- Vitamin B12 Injections
- Wart Removal
Pain management
- Knee Joint Injection
Preventive & Routine Care
- Smoking cessation counseling
Screenings & Diagnostics
- Bone Density Scan Referral
- Diabetes Screening and A1C Test
Sexual health
- STI Testing
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 3
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. Guide.md cannot book appointments or pass on messages — please call the office directly.
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.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.