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Dr. Merrill Ralph Nisam, MD
NPI1205824067PAC ID7214836857
- Medicare services, 2024
- 896
- Medicare patients, 2024
- 530
- Part D claims, 2024
- 1,316
- Publications
- 3
- MIPS score, 2024
- 81
- Practice address
- 250 Bon Air Road, Greenbrae, CA 94904
- Practice phone
- Call (415) 925-7900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Nisam's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Merrill Ralph Nisam is a pulmonologist in Greenbrae, California
Dr. Nisam practices at MarinHealth Medical Center in Greenbrae, California, part of Marin Healthcare District.
Dr. Nisam's NPI, 1205824067, was assigned on October 6, 2005. Dr. Nisam graduated from UC Davis School of Medicine in 1980. Dr. Nisam holds California license A49947.
NPI and contact details
- NPI
- 1205824067NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7214836857
- NPI enumeration date
- October 6, 2005
- NPI status
- Active
- Offers telehealth
- Yes
- Practice phone
- (415) 925-7900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 72
- Medical school graduation
- 1980
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Merrill Ralph Nisam practices at MarinHealth Medical Center in Greenbrae, California
Dr. Nisam's primary practice is MarinHealth Medical Center, at 250 Bon Air Road, Greenbrae, CA 94904 in Marin County. The practice phone is (415) 925-7900.
- MarinHealth Medical Center250 Bon Air Road, Greenbrae, CA 94904 · Marin CountyPhone(415) 925-7900
Source: Dmand AI Affiliation Data
Dr. Merrill Ralph Nisam is affiliated with 4 sites of care and 3 medical groups
Dr. Nisam's primary practice is MarinHealth Medical Center in Greenbrae, California, part of Marin Healthcare District. Dr. Nisam is also affiliated with Novato Community Hospital. The medical group on file is UCSF Medical Group. Dmand AI also links Dr. Nisam to 2 more group practices and clinics and 2 medical groups, each named with a free account.
Novato Community HospitalUCSF Medical Group2 group practices and clinicsNames with a free account2 medical groupsNames with a free account
See all 7 affiliations for Dr. NisamSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Merrill Ralph Nisam's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nisam practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MarinHealth Medical Center | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Merrill Ralph Nisam is one of 1,339 pulmonologists in California
Pulmonary disease is Dr. Nisam's primary specialty in the NPI Registry, under taxonomy code 207RP1001X. Dr. Nisam is board certified in critical care medicine by the American Board of Internal Medicine. Dmand AI has Dr. Nisam's licenses on file in 2 states: California and Hawaii.
Specialties and state licenses
- Pulmonary disease, CaliforniaPrimary
- Hawaii license
Pulmonologists near Dr. Nisam
Counts of pulmonologists with a Dmand AI profile, by place and practice. Each opens the list.
1,339pulmonologists in California
3pulmonologists in Greenbrae
3pulmonologists at MarinHealth Medical CenterSources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Merrill Ralph Nisam billed Medicare for 896 services in 2024
CMS data shows 896 Medicare services from Dr. Nisam across 15 procedure codes in 2024, for 530 Medicare patients. Medicare paid $77,540 for them.
Medicare services, 2024896
Medicare patients530
Paid by Medicare$77,540
Procedure codes15
Dr. Nisam's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,1312024: 85125%
- Tests and treatments
- 2023: 772024: 3160%
- Other services
- 2023: 02024: 14
Where Dr. Nisam's Medicare services took place, 2024
- In an office73882%
- In a facility15818%
Dr. Nisam compared with the California median for pulmonologists, 2024
- Dr. Nisam
- California median
- Medicare services
- 896vs 64938% above
- Medicare patients
- 530vs 27295% above
- Part D claims
- 1,114vs 4212.6 times
Medians across 1,263 pulmonologists in California with Dmand AI profiles that report each measure.
Dr. Nisam'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.
Need commercial claims for Dr. Nisam?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nisam and other pulmonologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Merrill Ralph Nisam treated 530 Medicare patients in 2024, average age 77
CMS counts 530 Medicare patients who saw Dr. Nisam in 2024. The largest group is 75 to 84, with 249 patients. 75% of them have high cholesterol, and 68% have high blood pressure. 16% are also on Medicaid. Their average risk score is 1.46, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Nisam's median patient age at 72, with 51% women.
Medicare patients, 2024530
Average age77
Average risk score1.46
Also on Medicaid16%
Dr. Nisam's Medicare patients by age, 2024
Dr. Nisam's Medicare patients by sex, 2024
- Women29556%
- Men23544%
Chronic conditions among Dr. Nisam's Medicare patients, 2024
- High cholesterol75%
- High blood pressure68%
- Arthritis53%
- COPD41%
- Anxiety32%
- Ischemic heart disease31%
- Mood disorders31%
- Asthma28%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nisam's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women51%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Merrill Ralph Nisam wrote 1,316 Medicare Part D claims in 2024
In 2024, Dr. Nisam wrote 1,316 Medicare Part D claims for 294 patients. 38% of them were for generic drugs. CMS names the drug for 1,114 of them, across 25 drugs with 11 or more claims each, at $394,708 in total drug cost. In 2023, CMS named 1,291 claims across 26 drugs.
Part D claims, 20241,316
Drugs named by CMS25
Total drug cost$394,708
Part D patients294
Dr. Nisam's Part D claims by kind of drug, 2024
- Generic500 claims38%
- Brand-name816 claims62%
Dr. Nisam'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. Nisam's Part D claims, 2024
- Antibiotics6%83 of 1,316 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: 1,2912024: 1,11414%
Drugs named by CMS: 25 in 2024, 26 in 2023.
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. Merrill Ralph Nisam scored 81 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 81 out of 100 for Dr. Nisam for performance year 2024. CMS lists Dr. Nisam as offering telehealth.
- Offers telehealth
- Yes
Dr. Nisam's MIPS scores, performance year 2024
- 81of 100Final score
- 80.9of 100Quality
- 76of 100Promoting Interoperability
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
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. Merrill Ralph Nisam has 3 publications on record
Dmand AI links 3 papers to Dr. Nisam in 2017. Dr. Nisam's most frequent co-authors are Timothy Eugene Albertson, MD, MPH, PhD, Sarah E. Chesrown, MD and Thomas J. Nuckton, MD.
Papers3
Dr. Nisam's most frequent co-authors
- Timothy Eugene Albertson, MD, MPH, PhD1 shared paper
- Sarah E. Chesrown, MD1 shared paper
- Thomas J. Nuckton, MD1 shared paper
Recent publications by Dr. Nisam
Am Rev Respir Dis
Airway ResistanceChlorpheniramineCyclic AMP
Crit Care Med
ConjunctivaHyperventilationOxygen
See who Dr. Nisam researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Nisam works with, so you can find a warm path to the right pulmonologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Merrill Ralph Nisam received $2,824 in industry payments from 2016 to 2025
CMS Open Payments shows 74 general payments to Dr. Nisam from 18 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 90% of the total. AstraZeneca Pharmaceuticals LP paid the most, $471. It also lists 1 research payment totaling $650 in 2018.
General payments to Dr. Nisam by program year, 2016 to 2025
General payments to Dr. Nisam by kind, 2016 to 2025
$2.8Kin total
- Food and beverage$2,55490%
- Education$27010%
Companies that paid Dr. Nisam the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Merrill Ralph Nisam has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Nisam, most recently Regional Top Doctor in 2014.
Awards and honors for Dr. Nisam
- 2014
- Regional Top Doctor
- Undated
- Checkbook Top Doc
Source: Dmand AI Professional Profile Data
Dr. Merrill Ralph Nisam graduated from UC Davis School of Medicine
Dr. Nisam graduated from UC Davis School of Medicine in 1980.
- Medical school
- Board certified in critical care medicine
- Board certified in internal medicine
- Board certified in pulmonary disease
Source: Dmand AI Professional Profile Data
Dr. Merrill Ralph Nisam accepts plans from 9 insurance carriers
Dr. Nisam is in network with 9 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Blue Cross and Blue Shield of Kansas City
- +1 more carriersWith a free account
Plan types Dr. Nisam accepts, by number of carriers
- Medicare8
- PPO7
- HMO4
- POS4
- EPO3
Source: Dmand AI Insurance Network Data
Sources for Dr. Merrill Ralph Nisam's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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 percentiles | Doctors 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-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Merrill Ralph Nisam
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. Merrill Ralph Nisam's NPI number?
Dr. Merrill Ralph Nisam's NPI number is 1205824067. It was assigned on October 6, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Merrill Ralph Nisam?
Dr. Merrill Ralph Nisam is a pulmonologist in Greenbrae, California. The primary specialty in the NPI Registry is Pulmonary Disease Physician (taxonomy code 207RP1001X).
Where does Dr. Merrill Ralph Nisam practice?
Dr. Nisam practices at 250 Bon Air Road, Greenbrae, CA 94904. Dr. Nisam's primary practice is MarinHealth Medical Center in Greenbrae, California, part of Marin Healthcare District. Dmand AI also links Dr. Nisam to 2 group practices and clinics and 2 medical groups.
What is Dr. Merrill Ralph Nisam's office phone number?
The practice phone on file for Dr. Nisam is (415) 925-7900.
What is Dr. Merrill Ralph Nisam's medical license number?
Dr. Nisam holds California license A49947, one of the licenses on file in 2 states.
Which states has Dr. Merrill Ralph Nisam been licensed in?
Dmand AI has state licenses on file for Dr. Nisam in California (1981 to 2027) and Hawaii (2004 to 2014).
Which hospitals is Dr. Merrill Ralph Nisam affiliated with?
Dr. Nisam practices at MarinHealth Medical Center in Greenbrae, California. Dr. Nisam is also affiliated with Novato Community Hospital.
What medical group is Dr. Merrill Ralph Nisam part of?
Dr. Nisam is linked to UCSF Medical Group. Dmand AI links Dr. Nisam to 2 more medical groups.
Does Dr. Merrill Ralph Nisam accept Medicare?
Yes. CMS data shows Dr. Nisam billed Medicare for 896 services in 2024.
Does Dr. Merrill Ralph Nisam offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Nisam as offering telehealth services.
Show 11 more questionsShow fewer questions
What is Dr. Merrill Ralph Nisam's MIPS score?
Dr. Nisam's MIPS final score for performance year 2024 is 81 out of 100.
How many Medicare patients does Dr. Merrill Ralph Nisam see?
CMS counts 530 Medicare patients who saw Dr. Nisam in 2024, with an average age of 77.
Is Dr. Merrill Ralph Nisam board certified?
Yes. Dr. Nisam is board certified in critical care medicine by the American Board of Internal Medicine.
What services does Dr. Merrill Ralph Nisam bill to Medicare?
In 2024, Dr. Nisam's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99212) and office visit, established patient (99214).
Where did Dr. Merrill Ralph Nisam go to medical school?
Dr. Nisam graduated from UC Davis School of Medicine in 1980.
What drugs does Dr. Merrill Ralph Nisam prescribe most?
In 2024 Medicare Part D data, Dr. Nisam's most prescribed drugs by claims were Spiriva Respimat, Symbicort and Albuterol Sulfate Hfa.
Has Dr. Merrill Ralph Nisam received payments from drug or device companies?
CMS Open Payments shows $2,824 in general payments to Dr. Nisam from 18 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Merrill Ralph Nisam been practicing?
Dr. Nisam graduated from medical school in 1980, 46 years ago.
Does Dr. Merrill Ralph Nisam do research?
Dmand AI links 3 publications to Dr. Nisam.
Who does Dr. Merrill Ralph Nisam publish with?
Dr. Nisam's most frequent co-authors are Timothy Eugene Albertson, MD, MPH, PhD (1 shared paper), Sarah E. Chesrown, MD (1 shared paper) and Thomas J. Nuckton, MD (1 shared paper).
What insurance does Dr. Merrill Ralph Nisam accept?
Dr. Nisam is in network with 9 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
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