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DR. JOHN ROBERT NIENOW MD
NPI 1861472649
Internal Medicine - Infectious Disease in San Francisco, CA

Active since January 18, 2006Opted out of Medicare · through Jan 1, 2028
2186 GEARY BLVD STE 314, SAN FRANCISCO, CA 94115(415) 202-1550(415) 776-8233 Get Directions Write a Review

NPPES record last updated: May 6, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: May 6, 2025, Feb 4, 2020 (2 updates tracked since 2020).

About Dr. John Robert Nienow Md NPPES

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

DR. JOHN ROBERT NIENOW MD (NPI 1861472649) is an individual infectious disease provider in San Francisco, California, licensed in California (00G795490) and active in the NPI registry since January 2006. He has opted out of Medicare through January 1, 2028 and remains eligible to order and refer, maintains a secondary practice location in San Francisco, and is a graduate of Yale University School Of Medicine (1988).

NPPES Registry Identity

NPI1861472649
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameDR. JOHN ROBERT NIENOWCredential: MD
Location Address2186 GEARY BLVD STE 314San Francisco, CA 94115-3457
Mailing Address2186 Geary Blvd Ste 314San Francisco, CA 94115-3457 · (415) 202-1550 · Fax (415) 776-8233
Phone(415) 202-1550
Fax(415) 776-8233
Sole ProprietorNo
Medical School CMSYale University School Of MedicineGraduated 1988
Enumeration DateJanuary 18, 2006
Last NPPES UpdateMay 6, 20252 updates tracked since enumeration
NPPES CertifiedMay 6, 2025
✔ NPI 1861472649 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in CA · 00G795490
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
2186 GEARY BLVD STE 314, San Francisco, CA 94115
Open in Google Maps ↗

Secondary Practice Location 1

Location 1558 Clayton St, PSSB G500San Francisco, CA 94117-2907 · Phone (415) 746-1950 · Fax (415) 431-9909

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. John Robert Nienow Md has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from January 1, 2026 through January 1, 2028.

Opt-Out Effective DateJanuary 1, 2026
Opt-Out In Effect ThroughJanuary 1, 2028Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Areas of Expertise CMS Part B claims 6

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
332 services148 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
271 services120 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
41 services36 patients
Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit G0438
An annual wellness visit is a yearly appointment with your doctor to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's an opportunity to discuss your health status and goals and get a plan tailored for you.
19 services19 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
19 services19 patients
Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or G2212
This service refers to extended doctor visits where your healthcare provider spends additional time evaluating and managing your health beyond the primary procedure's required time. This includes each extra 15 minutes spent by the physician on the same day as the primary service.
15 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94115 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
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.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
7 suppliers21 claims52 services$6.09 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
5 suppliers12 claims13 services$0.96 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SHEENA KUMAR, M.D., INC
Family Medicine
2186 GEARY BLVD STE 314
SAN FRANCISCO, CA 94115
San Francisco County (415) 921-5300
SHEENA KUMAR MD
Family Medicine
2186 GEARY BLVD STE 314
SAN FRANCISCO, CA 94115
San Francisco County (415) 921-5300
GERALD S. ROBERTS M.D.
Internal Medicine (Gastroenterology)
2186 GEARY BLVD STE 314
SAN FRANCISCO, CA 94115
San Francisco County (415) 929-0600

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 John Nienow's NPI number?

The NPI number for John Nienow is 1861472649. It was assigned to this individual provider in the NPPES registry on January 18, 2006.

Where is John Nienow located?

John Nienow practices at 2186 Geary Blvd Ste 314, San Francisco, CA 94115. The listed phone number is (415) 202-1550.

What is John Nienow's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is John Nienow enrolled in Medicare?

No. John Nienow has opted out of Medicare through January 1, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for John Nienow was last updated on May 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months 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.