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Dr. Reena Mahajan, MD
NPI1457519910PAC ID5698067411
- Part D claims, 2024
- 355
- Publications
- 8
- Industry payments
- $632
- Affiliated sites
- 3
- Medical groups
- 3
- Practice address
- 9400 Rosecrans Avenue, Bellflower, CA 90706
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD
Acute Care Hospital outpatient department · Bellflower, California
Find Dr. Mahajan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Reena Mahajan is an internist in Bellflower, California
Dr. Mahajan practices at Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD in Bellflower, California.
Dr. Mahajan's NPI, 1457519910, was assigned on May 30, 2008. Dr. Mahajan graduated from George Washington University School of Medicine and Health Sciences in 2008. Dr. Mahajan's Georgia license number on file is 069678.
NPI and contact details
- NPI
- 1457519910NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5698067411
- NPI enumeration date
- May 30, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Reena Mahajan practices at Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD in Bellflower, California
Dr. Mahajan's primary practice is Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD, at 9400 Rosecrans Avenue, Bellflower, CA 90706.
- Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD9400 Rosecrans Avenue, Bellflower, CA 90706
Source: Dmand AI Affiliation Data
Dr. Reena Mahajan is affiliated with 3 sites of care and 3 medical groups
Dr. Mahajan's primary practice is Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD in Bellflower, California. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Mahajan to 2 more medical groups, 1 breast imaging center and 1 group practice or clinic, each named with a free account. Dr. Mahajan's employer is on file too: a hospital.
Kaiser Permanente Medical Group Bellflower Medical Offices - HOPDPrimary
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Reena Mahajan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mahajan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Reena Mahajan is one of 16,751 internists in California
Internal medicine is Dr. Mahajan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Mahajan is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Mahajan's licenses on file in 2 states: Georgia and California.
Specialties and state licenses
- Internal medicine, GeorgiaPrimary
- California license
Internists near Dr. Mahajan
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Reena Mahajan's patients have a median age of 65
Across all payers, Dmand AI patient panel data puts Dr. Mahajan's median patient age at 65, with 67% women.
Dr. Mahajan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women67%
- Men33%
Source: Dmand AI Patient Panel Data
Dr. Reena Mahajan wrote 355 Medicare Part D claims in 2024
In 2024, Dr. Mahajan wrote 355 Medicare Part D claims for 82 patients. 69% of them were for generic drugs. CMS names the drug for 210 of them, across 11 drugs with 11 or more claims each, at $642,310 in total drug cost. In 2023, CMS named 12 claims across 1 drug.
Part D claims, 2024355
Drugs named by CMS11
Total drug cost$642,310
Part D patients82
Dr. Mahajan's Part D claims by kind of drug, 2024
- Generic244 claims69%
- Brand-name111 claims31%
Dr. Mahajan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 122024: 2101650%
Drugs named by CMS: 11 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Reena Mahajan takes part in Medicare
Dr. Mahajan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Reena Mahajan has 8 publications on record
Dmand AI links 8 papers to Dr. Mahajan in 2013. 2013 was the busiest year, with 2. Dr. Mahajan's most frequent co-authors are Eileen Frances Dunne, MD, Bassel Fouad El-Rayes, MD and Nigel S. Key, MD.
Papers8
Dr. Mahajan's most frequent co-authors
- Eileen Frances Dunne, MD1 shared paper
- Bassel Fouad El-Rayes, MD1 shared paper
- Nigel S. Key, MD1 shared paper
Recent publications by Dr. Mahajan
AlgorithmsClinical CodingDelivery of Health Care, Integrated
Sex Transm Dis
Age DistributionChlamydia InfectionsCondylomata Acuminata
N Engl J Med
Factor VIIIGene Transfer TechniquesHalf-Life
See who Dr. Mahajan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Mahajan works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Reena Mahajan received $632 in industry payments in 2017
CMS Open Payments shows 4 general payments to Dr. Mahajan from 1 drug or device company in 2017. Travel and lodging make up the largest share, 83% of the total. Bristol-Myers Squibb Company paid the most, $632.
General payments to Dr. Mahajan by kind, 2017 to 2017
$632in total
- Travel and lodging$52683%
- Grants$10617%
Companies that paid Dr. Mahajan the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Reena Mahajan graduated from George Washington University School of Medicine and Health Sciences
Dr. Mahajan graduated from George Washington University School of Medicine and Health Sciences in 2008.
- Medical school
- Board certified in internal medicine
- Board certified in medical oncology
Source: Dmand AI Professional Profile Data
Dr. Reena Mahajan accepts plans from 2 insurance carriers
Dr. Mahajan is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Mahajan accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Reena Mahajan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Reena Mahajan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Reena Mahajan's NPI number?
Dr. Reena Mahajan's NPI number is 1457519910. It was assigned on May 30, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Reena Mahajan?
Dr. Reena Mahajan is an internist in Bellflower, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Reena Mahajan practice?
Dr. Mahajan practices at 9400 Rosecrans Avenue, Bellflower, CA 90706. Dr. Mahajan's primary practice is Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD in Bellflower, California. Dmand AI also links Dr. Mahajan to 2 medical groups, 1 breast imaging center and 1 group practice or clinic.
What is Dr. Reena Mahajan's medical license number?
Dr. Mahajan's Georgia license number on file is 069678, one of the licenses on file in 2 states.
Which states has Dr. Reena Mahajan been licensed in?
Dmand AI has state licenses on file for Dr. Mahajan in Georgia (2013 to 2014) and California (2014 to 2025).
What medical group is Dr. Reena Mahajan part of?
Dr. Mahajan is linked to Southern California Permanente Medical Group. Dmand AI links Dr. Mahajan to 2 more medical groups.
Does Dr. Reena Mahajan accept Medicare?
Yes. CMS lists Dr. Mahajan as accepting Medicare assignment.
Is Dr. Reena Mahajan board certified?
Yes. Dr. Mahajan is board certified in internal medicine by the American Board of Internal Medicine.
Where did Dr. Reena Mahajan go to medical school?
Dr. Mahajan graduated from George Washington University School of Medicine and Health Sciences in 2008.
What drugs does Dr. Reena Mahajan prescribe most?
In 2024 Medicare Part D data, Dr. Mahajan's most prescribed drugs by claims were Anastrozole, Dexamethasone and Enoxaparin Sodium.
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Has Dr. Reena Mahajan received payments from drug or device companies?
CMS Open Payments shows $632 in general payments to Dr. Mahajan from 1 company from 2017 to 2017. The largest total came from Bristol-Myers Squibb Company.
How long has Dr. Reena Mahajan been practicing?
Dr. Mahajan graduated from medical school in 2008, 18 years ago.
Does Dr. Reena Mahajan do research?
Dmand AI links 8 publications to Dr. Mahajan.
Who does Dr. Reena Mahajan publish with?
Dr. Mahajan's most frequent co-authors are Eileen Frances Dunne, MD (1 shared paper), Bassel Fouad El-Rayes, MD (1 shared paper) and Nigel S. Key, MD (1 shared paper).
What insurance does Dr. Reena Mahajan accept?
Dr. Mahajan is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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