NPI registry status
Active
2026 NPPES data Hematology & Oncology Physician NPI 1154443091 M.D
Verify on CMS → Karthi Subbannan, M.D
Hematology & Oncology Physician in Johns Creek, Georgia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 11,232 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
879
Medicare Part D claims · 150 beneficiaries · Hematology & Oncology Physician avg: 847
Generic prescribing
64%
generic claims · 36% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
68.4/100
▼ 15 pts below national avg 83.1 · Mid-tier
Industry payments
$1.5K
65 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Karthi Subbannan, M.D reported a CMS MIPS final score of 68.4/100 - below the 83.1 national average - and filed 879 Medicare Part D claims in 2023.
- 68.4/100
- MIPS score · -15 vs avg
- 879
- Part D claims, 2023
- 64%
- 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.
Karthi Subbannan, M.D's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
68 7th percentile higher than 7% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Karthi Subbannan, M.D sits
This provider among hematology & oncology physician peers
Across the 4,233 hematology & oncology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Karthi Subbannan, M.D writes more Part D claims than 57% of them and scores higher on MIPS quality than 4% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one hematology & oncology physician peer from a representative sample of 60; the gold marker is Karthi Subbannan, M.D. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Karthi Subbannan, M.D practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations - 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 Karthi Subbannan, M.D?
Below national averagePrimary specialty
Hematology & Oncology Physician
Medicare Part D claims
879 4% vs specialty avg
MIPS final score
68.4/100 14.7 pts vs avg
Specialty distribution in Georgia
How Hematology & Oncology Physician compares to other specialties among Georgia providers
Medicare quality performance, MIPS
Karthi Subbannan, M.D's 2023 MIPS final score plotted against the Hematology & Oncology Physician national average
- MIPS Final Score
- 68.4/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Hematology & Oncology Physician) - 68.4/100 vs national avg 83.1
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).
Karthi Subbannan, M.D appears in the CMS NPPES registry as a Hematology & Oncology Physician provider holding M.D credentials at 6300 HOSPITAL PKWY STE 300, Johns Creek, GA, 30097, with a listed phone of (770) 623-8965. NPI 1154443091 was issued on 04/04/2007.
Medicare Part D records for calendar year 2023 show 879 prescription claims written by this provider, covering 150 Medicare beneficiaries and totaling roughly $1.7 million in drug spend, split 36% brand-name and 64% generic by claim count, with an opioid prescribing rate of 6.5%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 68.4/100 for the 2023 performance year (Quality 70.8, Cost 40.2), compared with the national average of 83.1.
Hematology & Oncology Physician is a mid-sized specialty nationwide, with 11,232 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 | 1154443091 |
|---|---|
| Specialty | Hematology & Oncology Physician |
| Credentials | M.D |
| Gender | Female |
| NPI Issued | 04/04/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
68.3891
Final Score
Avg: 83.1
70.8255
Quality
40.249
Cost
Reporting: Group practice
Hospital and facility affiliations
Facilities where Karthi Subbannan, M.D 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.
Legacy Healthcare Services Inc
Winder, GA
Nsh Cancer Institute Professional Services G LLC
Duluth, GA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Karthi Subbannan, M.D. Source: openpaymentsdata.cms.gov.
Total received
$1.5K
Largest payer
PFIZER INC.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Above average
Karthi Subbannan, M.D - brand share 36.0%
Hematology & Oncology Physician average
36% brand-name claims vs 64% generic, on 879 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.
879
Total Claims
$1.7M
Total Drug Cost
150
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,346
- Total Day Supply
- 38,217
- Brand vs Generic
- 36% brand / 64% generic
- Brand Drug Cost
- $1.6M
- Generic Drug Cost
- $47K
- Opioid Claims
- 57 (6.5% rate)
Patient Demographics
- Average Patient Age
- 73.8 years
- Avg HCC Risk Score
- 1.75
- Gender Split
- 74% female / 26% male
- Age Distribution
- <65: 14, 65-74: 64, 75-84: 53, 85+: 19
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Karthi Subbannan, M.D prescribes most
Top Medicare Part D drugs by claim count, 2023
- Eliquis
Eliquis
154 claims
- Anastrozole
Anastrozole
69 claims
- Hydroxyurea 56
Hydroxyurea
56 claims
- Xarelto 48
Xarelto
48 claims
- Letrozole 40
Letrozole
40 claims
- Tamoxifen Citrate 33
Tamoxifen Citrate
33 claims
- Oxycodone Hcl 26
Oxycodone Hcl
26 claims
- Tasigna 25
Tasigna
25 claims
| Drug | Claims |
|---|---|
| Eliquis Apixaban | 154 |
| Anastrozole | 69 |
| Hydroxyurea | 56 |
| Xarelto Rivaroxaban | 48 |
| Letrozole | 40 |
| Tamoxifen Citrate | 33 |
| Oxycodone Hcl | 26 |
| Tasigna Nilotinib Hcl | 25 |
| Jantoven Warfarin Sodium | 24 |
| Ondansetron Hcl | 20 |
* 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 Karthi Subbannan, M.D fits within the Hematology & Oncology Physician landscape nationally.
11,232
Hematology & Oncology Physician Providers in US
54
States with Hematology & Oncology Physician
847
Avg Claims per Provider
Karthi Subbannan, M.D's 879 claims are above the specialty average of 847.
Nearby Hematology & Oncology Physician Providers in Georgia
Other clinicians with the same primary specialty enrolled in Georgia, drawn from the same CMS NPPES roster as Subbannan.
Dr. Bamidele Adesunloye
MD
Newnan, GA
Dr. Shubham Adroja
M.D.
Augusta, GA
Dr. Simbo Aduloju
M.D
Decatur, GA
Dr. Victoria Afshani
MD
Covington, GA
Dr. Arvind Aggarwal
M.D.
Macon, GA
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 Georgia 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
What is Karthi Subbannan, M.D's specialty? ▼
Karthi Subbannan, M.D specializes in Hematology & Oncology Physician and practices in Johns Creek, Georgia. Credentials: M.D.
How much does Karthi Subbannan, M.D prescribe under Medicare Part D? ▼
In 2023, Karthi Subbannan, M.D wrote 879 Medicare Part D claims totaling $1.7M in drug costs for 150 beneficiaries.
What is Karthi Subbannan, M.D's Medicare quality score? ▼
Karthi Subbannan, M.D has a CMS MIPS Final Score of 68.4/100 (Quality: 70.8, Cost: 40.2). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Karthi Subbannan, M.D located? ▼
Karthi Subbannan, M.D is located at 6300 HOSPITAL PKWY STE 300, Johns Creek, GA, 30097. Phone: (770) 623-8965.
What is Karthi Subbannan, M.D's NPI number? ▼
Karthi Subbannan, M.D's National Provider Identifier (NPI) is 1154443091, issued on 04/04/2007.
Does Karthi Subbannan, M.D prescribe more brand-name or generic drugs? ▼
Karthi Subbannan, M.D's prescribing is 36% brand-name and 64% generic drugs by claim count, with $1.6M in brand drug costs.
Does Karthi Subbannan, M.D prescribe opioids? ▼
Yes, Karthi Subbannan, M.D had 57 opioid claims in 2023 with an opioid prescribing rate of 6.5%.
How many Hematology & Oncology Physician providers are there in the US? ▼
There are 11,232 Hematology & Oncology Physician providers across 54 states in the US. The average Hematology & Oncology Physician provider writes 847 Medicare Part D claims per year.
What drugs does Karthi Subbannan, M.D prescribe most often? ▼
Based on 2023 Medicare Part D data, Karthi Subbannan, M.D's most frequently prescribed drugs include Eliquis, Anastrozole, Hydroxyurea. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Karthi Subbannan, M.D accept Medicare? ▼
Karthi Subbannan, M.D appears in CMS Medicare data with 879 Part D claims and 150 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karthi Subbannan, M.D's credentials? ▼
Karthi Subbannan, M.D's NPI is 1154443091 with credentials M.D. 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 (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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
Compiled from official public sources by the PlainDoctor editorial team.
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 May 2026.