Dr. Ramesh V. Nathan, MD

  • Thousand Oaks, CA
  • Infectious disease specialist
NPI1215025291PAC ID1951349141
Medicare services, 2024
49,771
Medicare patients, 2024
691
Part D claims, 2024
1,908
Publications
11
Clinical trials
5
Practice address
375 E Rolling Oaks Dr, Thousand Oaks, CA 91361
Practice phone
Call (805) 777-8956
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Thousand Oaks Surgical Institute, A.M.C

Thousand Oaks, California

See all 10 affiliations

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Dr. Ramesh V. Nathan is an infectious disease specialist in Thousand Oaks, California

Dr. Nathan practices at Thousand Oaks Surgical Institute, A.M.C in Thousand Oaks, California.

Dr. Nathan's NPI, 1215025291, was assigned on October 11, 2006. Dr. Nathan graduated from George Washington University School of Medicine and Health Sciences in 2000. Dr. Nathan's California license number on file is A77898.

NPI and contact details
Medicare PAC ID
1951349141
NPI enumeration date
October 11, 2006
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(805) 777-8956
Professional email
Get email
Personal email
Get email
Mobile number
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Sex
Male
Estimated age
52
Medical school graduation
2000

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Ramesh V. Nathan practices at Thousand Oaks Surgical Institute, A.M.C in Thousand Oaks, California

Dr. Nathan's primary practice is Thousand Oaks Surgical Institute, A.M.C, at 375 E Rolling Oaks Dr, Thousand Oaks, CA 91361 in Ventura County. The practice phone is (805) 777-8956.

  • Thousand Oaks Surgical Institute, A.M.C
    375 E Rolling Oaks Dr, Thousand Oaks, CA 91361 · Ventura CountyPhone(805) 777-8956

Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data

Dr. Ramesh V. Nathan is affiliated with 8 sites of care and 2 medical groups

Dr. Nathan's primary practice is Thousand Oaks Surgical Institute, A.M.C in Thousand Oaks, California. Dr. Nathan is also affiliated with Los Robles Regional Medical Center. The medical group on file is Mazur Statner And Dutta Medical Group. Dmand AI also links Dr. Nathan to 2 more hospitals, 3 home health agencies, 1 group practice or clinic and 1 medical group, each named with a free account.

See all 10 affiliations for Dr. Nathan

Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data

Dmand AI tracks the EHR system at Dr. Ramesh V. Nathan's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nathan practices, 7 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Thousand Oaks Surgical Institute, A.M.CAvailable with a free account
+7 more sites and 1 medical groupAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Ramesh V. Nathan is one of 1,054 infectious disease specialists in California

Infectious disease is Dr. Nathan's primary specialty in the NPI Registry, under taxonomy code 207RI0200X. Dr. Nathan is board certified in infectious disease by the American Board of Internal Medicine. Dr. Nathan has a license on file in California.

Specialties and state licenses

  • Infectious disease, CaliforniaPrimaryLicense A77898 · 2002 to 2025 · taxonomy 207RI0200X

Clinical focus

Dmand AI lists acute skin infection, facial skin infection, immune deficiency disease, joint or bone infection, pneumonia, shingles and UTI among the conditions Dr. Nathan treats.

Infectious disease specialists near Dr. Nathan

Counts of infectious disease specialists with a Dmand AI profile, by place and practice. Each opens the list.

1,054infectious disease specialists in California
5infectious disease specialists in Thousand Oaks

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. Ramesh V. Nathan billed Medicare for 49,771 services in 2024

CMS data shows 49,771 Medicare services from Dr. Nathan across 17 procedure codes in 2024, for 691 Medicare patients. Medicare paid $264,980 for them.

Medicare services, 202449,771
Medicare patients691
Paid by Medicare$264,980
Procedure codes17

Dr. Nathan's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Drugs given in the office
2023: 02024: 46,844
Office and hospital visits
2023: 2,7252024: 2,40712%
Tests and treatments
2023: 722024: 409468%
Other services
2023: 1002024: 8515%
Surgery
2023: 02024: 26
Lab and pathology
2023: 172024: 0100%

Where Dr. Nathan's Medicare services took place, 2024

  • In an office47,86396%
  • In a facility1,9084%

Dr. Nathan compared with the California median for infectious disease specialists, 2024

  • Dr. Nathan
  • California median
Medicare services
49,771vs 429116.0 times
Medicare patients
691vs 1803.8 times
Part D claims
1,588vs 11913.3 times

Medians across 930 infectious disease specialists in California with Dmand AI profiles that report each measure.

Dr. Nathan's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Dr. Nathan

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Ramesh V. Nathan treated 691 Medicare patients in 2024, average age 76

CMS counts 691 Medicare patients who saw Dr. Nathan in 2024. The largest group is 65 to 74, with 260 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 17% are also on Medicaid. Their average risk score is 2.33, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Nathan's median patient age at 70, with 47% women.

Medicare patients, 2024691
Average age76
Average risk score2.33
Also on Medicaid17%

Dr. Nathan's Medicare patients by age, 2024

Dr. Nathan's Medicare patients by sex, 2024

  • Women35952%
  • Men33248%

Chronic conditions among Dr. Nathan's Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Arthritis59%
  4. Ischemic heart disease47%
  5. Diabetes40%
  6. Chronic kidney disease39%
  7. Heart failure39%
  8. Mood disorders38%

Share of Medicare patients with each condition. A patient can have several.

Dr. Nathan's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 70

Patient panel by sex, all payers

  • Women47%
  • Men53%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Ramesh V. Nathan wrote 1,908 Medicare Part D claims in 2024

In 2024, Dr. Nathan wrote 1,908 Medicare Part D claims for 214 patients. 87% of them were for generic drugs. CMS names the drug for 1,588 of them, across 68 drugs with 11 or more claims each, at $145,693 in total drug cost. In 2023, CMS named 1,662 claims across 67 drugs.

Part D claims, 20241,908
Drugs named by CMS68
Total drug cost$145,693
Part D patients214

Dr. Nathan's Part D claims by kind of drug, 2024

  • Generic1,666 claims87%
  • Brand-name and other242 claims13%

Dr. Nathan'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.

Drug classes CMS tracks in Dr. Nathan's Part D claims, 2024

  • Opioids1%19 of 1,908 claims
  • Antibiotics17%326 of 1,908 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 1,6622024: 1,5884%

Drugs named by CMS: 68 in 2024, 67 in 2023.

See all prescribing by Dr. Nathan

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

Dr. Ramesh V. Nathan scored 75 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Nathan for performance year 2024, reported individually. Dr. Nathan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Nathan as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes
MIPS final score, 2024
75 of 100

Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026

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Dr. Ramesh V. Nathan has 11 publications on record

Dmand AI links 11 papers to Dr. Nathan, published from 2020 to 2022. 2020 was the busiest year, with 3. Dr. Nathan's most frequent co-authors are Richard Lowell Hengel, MD, Timothy E. Ritter, MD and John Richard Dingilian, MD.

Papers11
Years published2020 to 2022

Dr. Nathan's papers by year, 2020 to 2022

Dr. Nathan's most frequent co-authors

Recent publications by Dr. Nathan

See all 11 publications and co-authors

See who Dr. Nathan researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Nathan works with, so you can find a warm path to the right infectious disease specialists.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Ramesh V. Nathan has worked on 5 clinical trials

Dmand AI links Dr. Nathan to 5 clinical trials. 1 is still active or recruiting. Conditions studied include COVID-19, Pneumonia, Viral and Alzheimer Disease. Eli Lilly and Company sponsors the most, 3. Open Payments lists research payments to Dr. Nathan that name 3 trials.

Clinical trials with Dr. Nathan by phase

  1. NonePhase 1: no trials
  2. NonePhase 2: no trials
  3. 1Phase 2/3: 1 trial
  4. NonePhase 3: no trials
  5. 1Phase 4: 1 trial

Conditions in Dr. Nathan's trials

  • COVID-19
  • Pneumonia, Viral
  • Alzheimer Disease
  • Severe Acute Respiratory Syndrome
  • Tauopathies

Investigators on the most trials with Dr. Nathan

Recent clinical trials with Dr. Nathan

Sources: Open Payments (CMS), 2025 data, released July 7, 2026; Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)

Dr. Ramesh V. Nathan received $70,221 in industry payments from 2016 to 2025

CMS Open Payments shows 241 general payments to Dr. Nathan from 29 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 53% of the total. Merck Sharp & Dohme Corporation paid the most, $26,338. It also lists 5 research payments totaling $270,675 from 2020 to 2022, naming 3 clinical trials.

General payments to Dr. Nathan by program year, 2016 to 2025

General payments to Dr. Nathan by kind, 2016 to 2025

$70.2Kin total
  • Speaker and faculty fees$37,12053%
  • Honoraria$13,35419%
  • Travel and lodging$12,68818%
  • Food and beverage$5,2537%
  • Other$1,7563%

Companies that paid Dr. Nathan the most, 2016 to 2025

Share is of all general payments to this clinician.

See all payments to Dr. Nathan

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Ramesh V. Nathan has 13 awards and honors on record

Dmand AI lists 13 awards for Dr. Nathan, most recently Faculty Teaching Award in 2023. Dr. Nathan serves on Antimicrobial Management Program.

Awards and honors for Dr. Nathan

  1. 2023
    • Faculty Teaching Award
  2. 2022
    • Sub specialty Faculty Teaching Award
  3. 2015
    • Fellow
  4. 2003
    • Solomon Scholars Research Award
  5. 1999
    • Class Curriculum Representative Commendation
  6. 1996
    • University Honors Program
See all 13 awards

Dr. Nathan's committees and leadership roles

Antimicrobial Management ProgramCo-Director
2012 to present
Medical Executive CommitteeChief of Staff
2013 to 2015

Source: Dmand AI Professional Profile Data

Dr. Ramesh V. Nathan graduated from George Washington University School of Medicine and Health Sciences

Dr. Nathan graduated from George Washington University School of Medicine and Health Sciences in 2000. Dr. Nathan is a member of IDSA.

  1. Medical schoolGeorge Washington University School of Medicine and Health Sciences
  2. Board certified in infectious diseaseAmerican Board of Internal Medicine
  3. Board certified in internal medicineAmerican Board of Internal Medicine

Source: Dmand AI Professional Profile Data

Dr. Ramesh V. Nathan accepts plans from 11 insurance carriers

Dr. Nathan is in network with 11 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.

  • Aetna
  • Elevance
  • Blue Cross Blue Shield of Michigan
  • United Healthcare
  • Humana
  • Blue Cross Blue Shield of Massachusetts
  • HCSC
  • Regence Health Plans
  • +3 more carriersWith a free account

Plan types Dr. Nathan accepts, by number of carriers

  1. Medicare9
  2. PPO9
  3. HMO6
  4. POS4
  5. EPO2

Source: Dmand AI Insurance Network Data

Sources for Dr. Ramesh V. Nathan's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare 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 percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Clinical trials and co-investigatorsDmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Awards and committee rolesDmand AI Professional Profile Data
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Ramesh V. Nathan

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. Ramesh V. Nathan's NPI number?

Dr. Ramesh V. Nathan's NPI number is 1215025291. It was assigned on October 11, 2006, and it is active in the NPI Registry.

What kind of doctor is Dr. Ramesh V. Nathan?

Dr. Ramesh V. Nathan is an infectious disease specialist in Thousand Oaks, California. The primary specialty in the NPI Registry is Infectious Disease Physician (taxonomy code 207RI0200X).

Where does Dr. Ramesh V. Nathan practice?

Dr. Nathan practices at 375 E Rolling Oaks Dr, Thousand Oaks, CA 91361. Dr. Nathan's primary practice is Thousand Oaks Surgical Institute, A.M.C in Thousand Oaks, California. Dmand AI also links Dr. Nathan to 2 hospitals, 3 home health agencies, 1 group practice or clinic and 1 medical group.

What is Dr. Ramesh V. Nathan's office phone number?

The practice phone on file for Dr. Nathan is (805) 777-8956.

What is Dr. Ramesh V. Nathan's medical license number?

Dr. Nathan's California license number on file is A77898.

Which hospitals is Dr. Ramesh V. Nathan affiliated with?

Dr. Nathan is affiliated with Los Robles Regional Medical Center. Dmand AI links Dr. Nathan to 2 more hospitals.

What medical group is Dr. Ramesh V. Nathan part of?

Dr. Nathan is linked to Mazur Statner And Dutta Medical Group. Dmand AI links Dr. Nathan to 1 more medical group.

Does Dr. Ramesh V. Nathan accept Medicare?

Yes. CMS data shows Dr. Nathan billed Medicare for 49,771 services in 2024, and Dr. Nathan accepts Medicare assignment.

Does Dr. Ramesh V. Nathan offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Dr. Nathan as offering telehealth services.

What is Dr. Ramesh V. Nathan's MIPS score?

Dr. Nathan's MIPS final score for performance year 2024 is 75 out of 100, reported individually.

Show 10 more questionsShow fewer questions

How many Medicare patients does Dr. Ramesh V. Nathan see?

CMS counts 691 Medicare patients who saw Dr. Nathan in 2024, with an average age of 76.

Is Dr. Ramesh V. Nathan board certified?

Yes. Dr. Nathan is board certified in infectious disease by the American Board of Internal Medicine.

What services does Dr. Ramesh V. Nathan bill to Medicare?

In 2024, Dr. Nathan's most billed Medicare services were injected or infused drug (J0878), hospital inpatient care (99233) and injected or infused drug (J0696).

Where did Dr. Ramesh V. Nathan go to medical school?

Dr. Nathan graduated from George Washington University School of Medicine and Health Sciences in 2000.

What drugs does Dr. Ramesh V. Nathan prescribe most?

In 2024 Medicare Part D data, Dr. Nathan's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Amlodipine Besylate.

Has Dr. Ramesh V. Nathan received payments from drug or device companies?

CMS Open Payments shows $70,221 in general payments to Dr. Nathan from 29 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.

How long has Dr. Ramesh V. Nathan been practicing?

Dr. Nathan graduated from medical school in 2000, 26 years ago.

Does Dr. Ramesh V. Nathan do research?

Dmand AI links 11 publications to Dr. Nathan, published from 2020 to 2022. Dr. Nathan has worked on 5 clinical trials.

Who does Dr. Ramesh V. Nathan publish with?

Dr. Nathan's most frequent co-authors are Richard Lowell Hengel, MD (3 shared papers), Timothy E. Ritter, MD (3 shared papers) and John Richard Dingilian, MD (2 shared papers).

What insurance does Dr. Ramesh V. Nathan accept?

Dr. Nathan is in network with 11 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.

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