NPI registry status
Active
2026 NPPES data Hematology & Oncology Physician NPI 1609017946 MBBS
Verify on CMS → 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 11,530 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.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
2K
Medicare Part D claims · 420 beneficiaries · Hematology & Oncology Physician avg: 885
Generic prescribing
92%
generic claims · 8% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Chenthilmurugan Rathnasabapathy, MBBS filed 1,711 Medicare Part D claims in 2024 as a Hematology & Oncology Physician in Sun City West, Arizona, prescribing 92% generic.
- 2K
- Part D claims, 2024
- 92%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥82nd
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Chenthilmurugan Rathnasabapathy, MBBS
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1609017946), first enumerated 03/17/2009.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,711 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1609017946 · Hematology & Oncology Physician
NPI-10 · ENUM-MID · TAX-MID · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1609017946
- ENUM-MID 2009
- TAX-MID 12K Hematology &
- RX-MID 1,711
- BOOK-THIN 241 in Arizona
- PHOTO-ENUM Antoine Harb · 2009
Chenthilmurugan Rathnasabapathy, MBBS's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,711 ≥ 82nd percentile 82% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
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
Hematology & Oncology Physician
Medicare Part D claims
1,711 93% vs specialty avg
Specialty distribution in Arizona
How Hematology & Oncology Physician compares to other specialties among Arizona providers
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:
How MIPS and board certification work
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).
Practice Address
Provider Details
| NPI | 1609017946 |
|---|---|
| Specialty | Hematology & Oncology Physician |
| Credentials | MBBS |
| Gender | Male |
| NPI Issued | 03/17/2009 |
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.
Banner Cancer Center Specialists LLC
Sun City, AZ
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 · Generic-heavy
Chenthilmurugan Rathnasabapathy, MBBS - brand share 8.0%
Hematology & Oncology Physician average
8% brand-name claims vs 92% generic, on 1,711 2024 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 2024.
1,711
Total Claims
$951K
Total Drug Cost
420
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,391.567
- Total Day Supply
- 99,794
- Brand vs Generic
- 8% brand / 92% generic
- Brand Drug Cost
- $802K
- Generic Drug Cost
- $149K
- Opioid Claims
- 29 (1.7% rate)
Patient Demographics
- Average Patient Age
- 75.4 years
- Avg HCC Risk Score
- 1.47
- Gender Split
- 94% female / 6% male
- Age Distribution
- <65: 20, 65-74: 171, 75-84: 182, 85+: 47
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Chenthilmurugan Rathnasabapathy, MBBS prescribes most
Top Medicare Part D drugs by claim count, 2024
- Anastrozole
Anastrozole
720 claims
- Letrozole 259
Letrozole
259 claims
- Tamoxifen Citrate 79
Tamoxifen Citrate
79 claims
- Ondansetron Hcl 76
Ondansetron Hcl
76 claims
- Exemestane 71
Exemestane
71 claims
- Lidocaine-Prilocaine 54
Lidocaine-Prilocaine
54 claims
- Potassium Chloride 51
Potassium Chloride
51 claims
- Prochlorperazine M… 47
Prochlorperazine Maleate
47 claims
| Drug | Claims |
|---|---|
| Anastrozole | 720 |
| Letrozole | 259 |
| Tamoxifen Citrate | 79 |
| Ondansetron Hcl | 76 |
| Exemestane | 71 |
| Lidocaine-Prilocaine Lidocaine/Prilocaine | 54 |
| Potassium Chloride | 51 |
| Prochlorperazine Maleate | 47 |
| Alendronate Sodium | 42 |
| Gabapentin | 38 |
* 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.
11,530
Hematology & Oncology Physician Providers in US
54
States with Hematology & Oncology Physician
885
Avg Claims per Provider
Chenthilmurugan Rathnasabapathy, MBBS's 1,711 claims are above the specialty average of 885.
Nationwide Hematology & Oncology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Rathnasabapathy, both outside Arizona so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2009)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
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.
One of 241 Hematology & Oncology Physician providers enrolled in Arizona, 5 are shown here.
Dr. Ahmed Abdelaziz
M.D.
Tucson, AZ
Oluseyi Abidoye
Phoenix, AZ
Dr. Roberta Adams
M.D.
Scottsdale, AZ
Dr. Clarence Adoo
M.D.
Peoria, AZ
Dr. Yusuf Ahmad
M.D.
Oro Valley, AZ
Compare Hematology & Oncology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Chenthilmurugan Rathnasabapathy, MBBS's specialty? ▼
Chenthilmurugan Rathnasabapathy, MBBS specializes in Hematology & Oncology Physician and practices in Sun City West, Arizona. Credentials: MBBS.
How much does Chenthilmurugan Rathnasabapathy, MBBS prescribe under Medicare Part D? ▼
In 2024, Chenthilmurugan Rathnasabapathy, MBBS wrote 1,711 Medicare Part D claims totaling $951K in drug costs for 420 beneficiaries.
Where is Chenthilmurugan Rathnasabapathy, MBBS located? ▼
Chenthilmurugan Rathnasabapathy, MBBS is located at 14416 W. MEEKER BLVD, Sun City West, AZ, 85375. Phone: (623) 876-3880.
What is Chenthilmurugan Rathnasabapathy, MBBS's NPI number? ▼
Chenthilmurugan Rathnasabapathy, MBBS's National Provider Identifier (NPI) is 1609017946, issued on 03/17/2009.
Does Chenthilmurugan Rathnasabapathy, MBBS prescribe more brand-name or generic drugs? ▼
Chenthilmurugan Rathnasabapathy, MBBS's prescribing is 8% brand-name and 92% generic drugs by claim count, with $802K in brand drug costs.
Does Chenthilmurugan Rathnasabapathy, MBBS prescribe opioids? ▼
Yes, Chenthilmurugan Rathnasabapathy, MBBS had 29 opioid claims in 2024 with an opioid prescribing rate of 1.7%.
How many Hematology & Oncology Physician providers are there in the US? ▼
There are 11,530 Hematology & Oncology Physician providers across 54 states in the US. The average Hematology & Oncology Physician provider writes 885 Medicare Part D claims per year.
What drugs does Chenthilmurugan Rathnasabapathy, MBBS prescribe most often? ▼
Based on 2024 Medicare Part D data, Chenthilmurugan Rathnasabapathy, MBBS's most frequently prescribed drugs include Anastrozole, Letrozole, Tamoxifen Citrate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Chenthilmurugan Rathnasabapathy, MBBS accept Medicare? ▼
Chenthilmurugan Rathnasabapathy, MBBS appears in CMS Medicare data with 1,711 Part D claims and 420 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Chenthilmurugan Rathnasabapathy, MBBS's credentials? ▼
Chenthilmurugan Rathnasabapathy, MBBS's NPI is 1609017946 with credentials MBBS. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- 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 (2024). 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 August 2026 (NPPES) / 2024 (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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.