Dr. Nerissa U. Ko, MD
- Medicare services, 2024
- 492
- Medicare patients, 2024
- 357
- Part D claims, 2024
- 86
- Publications
- 43
- MIPS score, 2024
- 99
- Practice address
- 505 Parnassus Ave, Box 0296, San Francisco, CA 94143
- Practice phone
- Call (415) 353-2733
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Ko'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. Nerissa U. Ko is a neurologist in San Francisco, California
Dr. Ko practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health.
Dr. Ko's NPI, 1821029059, was assigned on July 5, 2006. Dr. Ko graduated from John A. Burns School of Medicine in 1995. Dr. Ko holds California license A62792.
- NPI
- 1821029059NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3173600749
- NPI enumeration date
- July 5, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (415) 353-2733
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nerissa U. Ko practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California
Dr. Ko's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights, at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143 in San Francisco County. The practice phone is (415) 353-2733.
- UCSF Helen Diller Medical Center at Parnassus Heights505 Parnassus Ave, Box 0296, San Francisco, CA 94143 · San Francisco CountyPhone(415) 353-2733
Source: Dmand AI Affiliation Data
Dr. Nerissa U. Ko is affiliated with 5 sites of care and 5 medical groups
Dr. Ko's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. The medical group on file is UCSF Pediatrics. Dmand AI also links Dr. Ko to 4 more group practices and clinics and 4 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nerissa U. Ko's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ko practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UCSF Helen Diller Medical Center at Parnassus Heights | Available with a free account |
| +4 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nerissa U. Ko is one of 2,207 neurologists in California
Neurology is Dr. Ko's primary specialty in the NPI Registry, under taxonomy code 2084N0400X. Dr. Ko is board certified in neurology by the American Board of Psychiatry and Neurology. Dr. Ko is licensed in California.
Specialties and state licenses
- Neurology, CaliforniaPrimary
Clinical focus
Dmand AI lists acute mini-stroke (TIA), cerebrovascular disease, epilepsy, migraine and chronic headache and stroke among the conditions Dr. Ko treats.
Neurologists near Dr. Ko
Counts of neurologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Nerissa U. Ko billed Medicare for 492 services in 2024
CMS data shows 492 Medicare services from Dr. Ko across 8 procedure codes in 2024, for 357 Medicare patients. Medicare paid $36,608 for them.
Dr. Ko's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 2382024: 2568%
- Office and hospital visits
- 2023: 2342024: 20512%
- Other services
- 2023: 02024: 31
Where Dr. Ko's Medicare services took place, 2024
- In an office122%
- In a facility48098%
Dr. Ko compared with the California median for neurologists, 2024
- Dr. Ko
- California median
- Medicare services
- 492vs 40422% above
- Medicare patients
- 357vs 19088% above
- Part D claims
- 74vs 32477% below
Medians across 1,995 neurologists in California with Dmand AI profiles that report each measure.
Dr. Ko'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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nerissa U. Ko treated 357 Medicare patients in 2024, average age 75
CMS counts 357 Medicare patients who saw Dr. Ko in 2024. The largest group is 65 to 74, with 147 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 34% are also on Medicaid. Their average risk score is 1.55, 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. Ko's median patient age at 65, with 50% women.
Dr. Ko's Medicare patients by age, 2024
Dr. Ko's Medicare patients by sex, 2024
- Women17750%
- Men18050%
Chronic conditions among Dr. Ko's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Stroke or TIA48%
- Arthritis44%
- Ischemic heart disease41%
- Diabetes38%
- Mood disorders31%
- Atrial fibrillation30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ko's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women50%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nerissa U. Ko wrote 86 Medicare Part D claims in 2024
In 2024, Dr. Ko wrote 86 Medicare Part D claims for 21 patients. 80% of them were for generic drugs. CMS names the drug for 74 of them, across 4 drugs with 11 or more claims each, at $827 in total drug cost. In 2022, CMS named 78 claims across 4 drugs.
Dr. Ko's Part D claims by kind of drug, 2024
- Generic69 claims80%
- Brand-name17 claims20%
Dr. Ko's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 782023: 745%
Drugs named by CMS: 4 in 2023, 4 in 2022.
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. Nerissa U. Ko scored 99 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 99 out of 100 for Dr. Ko for performance year 2024, reported as part of a group. Dr. Ko accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Ko as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Ko's MIPS scores, performance year 2024
- 99of 100Final score
- 95of 100Quality
- 40of 100Improvement Activities
- 81of 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. Nerissa U. Ko has 43 publications on record
Dmand AI links 43 papers to Dr. Ko, published from 2005 to 2025. 2021 was the busiest year, with 5. The most frequent topics are Subarachnoid Hemorrhage, Cerebrovascular Circulation and Vasospasm, Intracranial. Dr. Ko has published most often in Stroke. Dr. Ko's most frequent co-authors are Wade S. Smith, MD, Steven W. Hetts, MD and Jose I. Suarez, MD.
Dr. Ko's papers by year, 2015 to 2025
Topics Dr. Ko writes about most
- Subarachnoid Hemorrhage
- Cerebrovascular Circulation
- Vasospasm, Intracranial
- Intracranial Aneurysm
- Intracranial Pressure
- Image Processing, Computer-Assisted
- Intracranial Hemorrhages
- Stents
Dr. Ko's most frequent co-authors
Recent publications by Dr. Ko
J Am Heart Assoc
See who Dr. Ko researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ko works with, so you can find a warm path to the right neurologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Nerissa U. Ko graduated from John A. Burns School of Medicine
Dr. Ko graduated from John A. Burns School of Medicine in 1995.
- Medical school
- Board certified in neurology
- Board certified in vascular neurology
- Board certified in neurocritical care
Source: Dmand AI Professional Profile Data
Dr. Nerissa U. Ko accepts plans from 9 insurance carriers
Dr. Ko is in network with 9 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- 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
- CMS Medicare
- +1 more carriersWith a free account
Plan types Dr. Ko accepts, by number of carriers
- Medicare8
- PPO6
- HMO3
- POS3
- EPO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Nerissa U. Ko'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 |
| 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. Nerissa U. Ko
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. Nerissa U. Ko's NPI number?
Dr. Nerissa U. Ko's NPI number is 1821029059. It was assigned on July 5, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Nerissa U. Ko?
Dr. Nerissa U. Ko is a neurologist in San Francisco, California. The primary specialty in the NPI Registry is Neurology Physician (taxonomy code 2084N0400X).
Where does Dr. Nerissa U. Ko practice?
Dr. Ko practices at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143. Dr. Ko's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. Dmand AI also links Dr. Ko to 4 group practices and clinics and 4 medical groups.
What is Dr. Nerissa U. Ko's office phone number?
The practice phone on file for Dr. Ko is (415) 353-2733.
What is Dr. Nerissa U. Ko's medical license number?
Dr. Ko holds California license A62792.
Which hospitals is Dr. Nerissa U. Ko affiliated with?
Dr. Ko practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California.
What medical group is Dr. Nerissa U. Ko part of?
Dr. Ko is linked to UCSF Pediatrics. Dmand AI links Dr. Ko to 4 more medical groups.
Does Dr. Nerissa U. Ko accept Medicare?
Yes. CMS data shows Dr. Ko billed Medicare for 492 services in 2024, and Dr. Ko accepts Medicare assignment.
Does Dr. Nerissa U. Ko offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Ko as offering telehealth services.
What is Dr. Nerissa U. Ko's MIPS score?
Dr. Ko's MIPS final score for performance year 2024 is 99 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Nerissa U. Ko see?
CMS counts 357 Medicare patients who saw Dr. Ko in 2024, with an average age of 75.
Is Dr. Nerissa U. Ko board certified?
Yes. Dr. Ko is board certified in neurology by the American Board of Psychiatry and Neurology.
What services does Dr. Nerissa U. Ko bill to Medicare?
In 2024, Dr. Ko's most billed Medicare services were blood vessel study (93880), critical care (99291) and hospital inpatient care (99233).
Where did Dr. Nerissa U. Ko go to medical school?
Dr. Ko graduated from John A. Burns School of Medicine in 1995.
What drugs does Dr. Nerissa U. Ko prescribe most?
In 2023 Medicare Part D data, Dr. Ko's most prescribed drugs by claims were Atorvastatin Calcium, Sertraline HCl and Clopidogrel.
How long has Dr. Nerissa U. Ko been practicing?
Dr. Ko graduated from medical school in 1995, 31 years ago.
Does Dr. Nerissa U. Ko do research?
Dmand AI links 43 publications to Dr. Ko, published from 2005 to 2025.
Who does Dr. Nerissa U. Ko publish with?
Dr. Ko's most frequent co-authors are Wade S. Smith, MD (6 shared papers), Steven W. Hetts, MD (5 shared papers) and Jose I. Suarez, MD (5 shared papers).
What insurance does Dr. Nerissa U. Ko accept?
Dr. Ko is in network with 9 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
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