NPI registry status
Active
2026 NPPES data Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician NPI 1164624615 MD, PHD
Verify on CMS → Ram Kumar Subramanyan, MD, PHD
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Los Angeles, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 5,174 in Thoracic Surgery (Cardiothoracic Vascular Surgery) 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.
Industry payments
$884
4 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Ram Kumar Subramanyan, MD, PHD is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Los Angeles, California, listed in the federal CMS National Provider Identifier registry.
- $884
- industry payments (Sunshine Act)
- #134
- Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician rank among California specialties
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 Ram Kumar Subramanyan, MD, PHD
Active federal NPI registry listing — verify license, disciplinary history, and board certification with official sources before relying on this profile.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1164624615), first enumerated 06/05/2007.
Source: CMS NPPES
- Not in federal data
Medicare Part D participation
No 2023 Medicare Part D prescribing volume appears in the CMS public file for this NPI (may reflect specialty, new enrollment, or non-prescribing role).
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Reported
Industry payment transparency
$884 in reported industry payments (4 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Ram Kumar Subramanyan, MD, PHD's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- 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 1164624615 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
NPI-10 · ENUM-MID · TAX-MID · RX-NONE · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1164624615
- ENUM-MID 2007
- TAX-MID 5K Thoracic Surgery
- RX-NONE No Part D
- BOOK-LIGHT 516 in California
- PHOTO-ENUM John Mehall, MD · 2007
◑
Board-eligible specialty (heuristic, not verified)
Ram Kumar Subramanyan, MD, PHD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Ram Kumar Subramanyan, MD, PHD?
Quality data not reportedPrimary specialty
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
Specialty distribution in California
How Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician compares to other specialties among California 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 Thoracic Surgery (Cardiothoracic Vascular Surgery) 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 | 1164624615 |
|---|---|
| Specialty | Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician |
| Credentials | MD, PHD |
| Gender | Male |
| NPI Issued | 06/05/2007 |
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 Ram Kumar Subramanyan, MD, PHD. Source: openpaymentsdata.cms.gov.
Total received
$884
Largest payer
Endo USA, 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.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Ram Kumar Subramanyan, MD, PHD. To verify Ram Kumar Subramanyan, MD, PHD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
More Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in CA →
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Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Overview
How Ram Kumar Subramanyan, MD, PHD fits within the Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician landscape nationally.
5,174
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Providers in US
52
States with Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
119
Avg Claims per Provider
Nationwide Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Subramanyan, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Subramanyan.
One of 516 Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers enrolled in California, 5 are shown here.
Frequently Asked Questions
What is Ram Kumar Subramanyan, MD, PHD's specialty? ▼
Ram Kumar Subramanyan, MD, PHD specializes in Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician and practices in Los Angeles, California. Credentials: MD, PHD.
Where is Ram Kumar Subramanyan, MD, PHD located? ▼
Ram Kumar Subramanyan, MD, PHD is located at 4650 W SUNSET BLVD # MS 66, Los Angeles, CA, 90027. Phone: (323) 361-5595.
What is Ram Kumar Subramanyan, MD, PHD's NPI number? ▼
Ram Kumar Subramanyan, MD, PHD's National Provider Identifier (NPI) is 1164624615, issued on 06/05/2007.
How many Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers are there in the US? ▼
There are 5,174 Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers across 52 states in the US. The average Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider writes 119 Medicare Part D claims per year.
Does Ram Kumar Subramanyan, MD, PHD accept Medicare? ▼
Ram Kumar Subramanyan, MD, PHD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ram Kumar Subramanyan, MD, PHD's credentials? ▼
Ram Kumar Subramanyan, MD, PHD's NPI is 1164624615 with credentials MD, PHD. 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.
- 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.