Chenthilmurugan Rathnasabapathy, MBBS
Hematology & Oncology Physician in Sun City West, Arizona. This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 11,215 in Hematology & Oncology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Chenthilmurugan Rathnasabapathy, MBBS filed 1,228 Medicare Part D claims in 2023 as a Hematology & Oncology Physician in Sun City West, Arizona, prescribing 90% generic.
- 1K
- Part D claims, 2023
- 90%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Chenthilmurugan Rathnasabapathy, MBBS's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,228 Top 22% higher than 78% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
Chenthilmurugan Rathnasabapathy, MBBS practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Chenthilmurugan Rathnasabapathy, MBBS?
Quality data not reportedPrimary specialty
Medicare Part D claims
Specialty distribution in Arizona
How Hematology & Oncology Physician compares to other specialties among Arizona providers
Largest specialties in Arizona (% of in-state providers)
Hematology & Oncology Physician ranks #79 among Arizona's specialties (0.2% of in-state providers)
Each bar is a specialty's share of the Arizona provider total, by primary NUCC taxonomy. The highlighted bar is Hematology & Oncology Physician; the long tail of smaller specialties is omitted for legibility.
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Hematology & Oncology Physician. Verify directly:
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Chenthilmurugan Rathnasabapathy, MBBS appears in the CMS NPPES registry as a Hematology & Oncology Physician provider holding MBBS credentials at 14416 W. MEEKER BLVD, Sun City West, AZ, 85375, with a listed phone of (623) 876-3880. NPI 1609017946 was issued on 03/17/2009. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Rathnasabapathy most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.
Medicare Part D records for calendar year 2023 show 1,228 prescription claims written by this provider, covering 328 Medicare beneficiaries and totaling roughly $774K in drug spend, split 10% brand-name and 90% generic by claim count, with an opioid prescribing rate of 2.5%. These figures capture only Medicare Part D, commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.
Hematology & Oncology Physician is a mid-sized specialty nationwide, with 11,215 enrolled providers across 54 states and an average of 847 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1609017946 |
|---|---|
| Specialty | Hematology & Oncology Physician |
| Credentials | MBBS |
| Gender | Male |
| NPI Issued | 03/17/2009 |
Verify this provider's license
PlainDoctor pulls this profile from the CMS NPPES public registry. Confirm Chenthilmurugan Rathnasabapathy, MBBS's current license status, disciplinary history, and board certifications with the Arizona Medical Board in Arizona before relying on this page for a clinical or care decision.
How we sourced this profile
Hospital and facility affiliations
Facilities where Chenthilmurugan Rathnasabapathy, MBBS bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
10% brand-name claims vs 90% generic, on 1,228 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
Prescribing Breakdown
- 30-Day Fills
- 2,458
- Total Day Supply
- 70,691
- Brand vs Generic
- 10% brand / 90% generic
- Brand Drug Cost
- $697K
- Generic Drug Cost
- $77K
- Opioid Claims
- 31 (2.5% rate)
Patient Demographics
- Average Patient Age
- 75.5 years
- Avg HCC Risk Score
- 1.50
- Gender Split
- 94% female / 6% male
- Age Distribution
- <65: 14, 65-74: 126, 75-84: 156, 85+: 32
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Chenthilmurugan Rathnasabapathy, MBBS prescribes most
Top Medicare Part D drugs by claim count, 2023
- Anastrozole
Anastrozole
408 claims
- Letrozole
Letrozole
168 claims
- Exemestane 128
Exemestane
128 claims
- Prochlorperazine M… 57
Prochlorperazine Maleate
57 claims
- Tamoxifen Citrate 46
Tamoxifen Citrate
46 claims
- Ondansetron Hcl 45
Ondansetron Hcl
45 claims
- Ondansetron Odt 45
Ondansetron Odt
45 claims
- Alendronate Sodium 40
Alendronate Sodium
40 claims
| Drug | Claims |
|---|---|
| Anastrozole | 408 |
| Letrozole | 168 |
| Exemestane | 128 |
| Prochlorperazine Maleate | 57 |
| Tamoxifen Citrate | 46 |
| Ondansetron Hcl | 45 |
| Ondansetron Odt Ondansetron | 45 |
| Alendronate Sodium | 40 |
| Potassium Chloride | 39 |
| Lidocaine-Prilocaine Lidocaine/Prilocaine | 31 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hematology & Oncology Physician Overview
How Chenthilmurugan Rathnasabapathy, MBBS fits within the Hematology & Oncology Physician landscape nationally.
Chenthilmurugan Rathnasabapathy, MBBS's 1,228 claims are above the specialty average of 847.
Nearby Hematology & Oncology Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Rathnasabapathy.
Compare Hematology & Oncology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Arizona medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hematology & Oncology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
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Data Sources
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology