Nerissa Ko, M.D.
NPI 1821029059 · Neurology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nerissa Ko, M.D. is a Neurology Physician provider in San Francisco, CA (NPI 1821029059).
Provider details
- NPI number
- 1821029059
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A62792 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
492 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Ultrasound of Both Sides of Head and Neck Blood Flow93880 | 226 | $41 |
| Critical Care, First 30-74 Minutes99291 | 66 | $231 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 53 | $132 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 33 | $88 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 31 | $19 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-05
- Last updated
- 2008-07-23
Frequently asked questions
- What is Nerissa Ko's NPI number?
- Nerissa Ko's National Provider Identifier (NPI) is 1821029059, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nerissa Ko's specialty?
- Nerissa Ko is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Nerissa Ko located?
- Nerissa Ko's practice location on file with NPPES is 400 Parnassus Ave Fl 8, San Francisco, CA 94143-2202.
- What is Nerissa Ko's phone number?
- The practice phone number listed in the NPPES registry for Nerissa Ko is (415) 353-1489.
- Does Nerissa Ko accept Medicare?
- Nerissa Ko is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nerissa Ko's NPI active?
- Yes — Nerissa Ko's NPI (1821029059) is active in the NPPES registry as of the last update on 2008-07-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.