1. Home
  2. Directory
  3. California
  4. San Francisco
  5. Nurse Practitioner
  6. NPI Profile

DR. NICHOLAS FISKE KEELER AG-ACNP, DNP, RN
NPI 1144840786
Nurse Practitioner - Acute Care in San Francisco, CA

Active since April 23, 2020PECOS EnrolledAccepts Medicare Assignment
400 PARNASSUS AVE STE 5015TH, SAN FRANCISCO, CA 94143(415) 353-9088(415) 353-3889 Get Directions Write a Review

NPPES record last updated: August 6, 2023. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Dr. Nicholas Fiske Keeler Ag-acnp, Dnp, Rn NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. NICHOLAS FISKE KEELER AG-ACNP, DNP, RN (NPI 1144840786) is an individual acute care provider in San Francisco, California, licensed in California (95013484) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, maintains a secondary practice location in Napa, and is a graduate of Other (2019).

NPPES Registry Identity

NPI1144840786
Entity TypeIndividualMale
Primary Taxonomy363LA2100X
Provider Legal NameDR. NICHOLAS FISKE KEELERCredential: AG-ACNP, DNP, RN
Location Address400 PARNASSUS AVE STE 5015THSan Francisco, CA 94143-2202
Mailing Address400 Parnassus Ave Ste 5015thSan Francisco, CA 94143-2202 · (415) 353-9088 · Fax (415) 353-3889
Phone(415) 353-9088
Fax(415) 353-3889
Sole ProprietorNo
Medical School CMSOtherGraduated 2019
Enumeration DateApril 23, 2020
Last NPPES UpdateAugust 6, 2023
NPPES CertifiedAugust 6, 2023
✔ NPI 1144840786 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Acute CarePhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LA2100X
License✔ Licensed in CA · 95013484
400 PARNASSUS AVE STE 5015TH, San Francisco, CA 94143
Open in Google Maps ↗

Secondary Practice Location 1

Location 11000 Trancas StNapa, CA 94558-2906 · Phone (707) 252-4411

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Nicholas Fiske Keeler Ag-acnp, Dnp, Rn is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6406278431
PECOS Enrollment IDI20200622001034
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

4

Medicare enrollment records show Nicholas Keeler reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

University Of California San Francisco
Same address
Surgery
400 PARNASSUS AVE, MCB 300
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 5,645 clinicians in this Medicare group
NPI 1346329380 (415) 353-2161
Ucsf Medical Group Business Services
Same address
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94122
  • Reassigned Medicare billing, California enrollment
  • 5,544 clinicians in this Medicare group
NPI 1477624104 (415) 353-2808
Regents Of The University Of California
0.1 mi
Endocrinology, Diabetes & Metabolism
505 PARNASSUS AVE
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 2,112 clinicians in this Medicare group
NPI 1376613943 (415) 353-2350
Providence Medical Foundation
40 mi
Obstetrics & Gynecology
1100 TRANCAS ST, SUITE 209
Napa, CA 94558
  • Reassigned Medicare billing, California enrollment
  • 1,699 clinicians in this Medicare group
NPI 1205131950 (707) 251-1850

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
125 services61 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
27 services27 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
15 services15 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
15 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Nicholas Keeler's NPI number?

The NPI number for Nicholas Keeler is 1144840786. It was assigned to this individual provider in the NPPES registry on April 23, 2020.

Where is Nicholas Keeler located?

Nicholas Keeler practices at 400 Parnassus Ave Ste 5015th, San Francisco, CA 94143. The listed phone number is (415) 353-9088.

What is Nicholas Keeler's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Acute Care, with taxonomy code 363LA2100X.

Is Nicholas Keeler enrolled in Medicare?

Yes. Nicholas Keeler is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Nicholas Keeler's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Keeler reassigns Medicare benefits to 4 organizations: University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA), Regents Of The University Of California (San Francisco, CA) and Providence Medical Foundation (Napa, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Nicholas Keeler's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Nicholas Keeler was last updated on August 6, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.