DR. HASSAN I. TAHSILDAR M.D.
NPI 1629067269
Internal Medicine - Medical Oncology in Green Bay, WI

Q: What is Hassan Tahsildar's NPI number?

The NPI number for Hassan Tahsildar is 1629067269. It was assigned to this individual provider in the NPPES registry on October 17, 2005.

Q: What is Hassan Tahsildar's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Q: When was this NPI record last updated?

The NPPES record for Hassan Tahsildar was last updated on January 14, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.

Active since October 17, 2005PECOS EnrolledAccepts Medicare Assignment

1580 COMMANCHE AVE, GREEN BAY, WI 54313(920) 435-8326 Get Directions Write a Review

NPPES record last updated: January 14, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jan 14, 2021, Feb 10, 2016 (2 updates tracked since 2016).

On this page

About Dr. Hassan I. Tahsildar M.d. NPPES

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

DR. HASSAN I. TAHSILDAR M.D. (NPI 1629067269) is an individual medical oncology provider in Green Bay, Wisconsin, licensed in Wisconsin (54846-020) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, is affiliated with Bellin Memorial Hospital, and maintains 3 additional practice locations.

NPPES Registry Identity

NPI1629067269

Entity TypeIndividualMale

Primary Taxonomy207RX0202X

Provider Legal NameDR. HASSAN I. TAHSILDARCredential: M.D.

Location Address1580 COMMANCHE AVEGreen Bay, WI 54313-5751

Mailing AddressPo Box 22487Green Bay, WI 54305-2487 · (920) 445-7222 · Fax (920) 445-7289

Phone(920) 435-8326

Sole ProprietorNo

Medical School CMSOtherGraduated 1985

Enumeration DateOctober 17, 2005

Last NPPES UpdateJanuary 14, 20212 updates tracked since enumeration

NPPES CertifiedJanuary 14, 2021

✔ NPI 1629067269 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RX0202X

License✔ Licensed in WI · 54846-020

Definition

An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.

1580 COMMANCHE AVE, Green Bay, WI 54313

Open in Google Maps ↗

Secondary Practice Locations 3

Location 1744 S Webster AveGreen Bay, WI 54301-3505 · Phone (920) 433-3500 · Fax (920) 445-7301

Location 2820 Arbutus AveOconto, WI 54153-2004 · Phone (920) 835-1100 · Fax (920) 835-1099

Location 32820 Roosevelt RdMarinette, WI 54143-3834 · Phone (715) 735-5225 · Fax (715) 735-5388

Other Identifiers 1

Other144620American Board Of Internal Medidice/medical Oncology

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Aspirus Health Plan, CareSource (Common Ground Healthcare).Insurance ›

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. Hassan I. Tahsildar M.d. 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 ID244427961

PECOS Enrollment IDI20101207001253

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

Medicare enrollment records show Hassan Tahsildar reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Bellin Memorial Hospital Inc

Same address

Family Medicine

1580 COMMANCHE AVE
Green Bay, WI 54313

Reassigned Medicare billing, Wisconsin enrollment
875 clinicians in this Medicare group

NPI 1124081484 (920) 445-7295

Oconto Hospital & Medical Center, Inc.

27 mi

Rural Health

107 E HIGHLAND DR
Oconto Falls, WI 54154

Reassigned Medicare billing, Wisconsin enrollment
573 clinicians in this Medicare group

NPI 1063038313 (920) 846-3092

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 3

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.

213 services106 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.

32 services25 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

21 services21 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Bellin Memorial Hospital

Acute Care Hospitals · Green Bay, WI

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number520049

Location744 S Webster AveGreen Bay, WI 54305 · Brown County

Emergency services Birthing friendly

Bellin Health Oconto Hospital

Critical Access Hospitals · Oconto, WI

OwnershipVoluntary non-profit - Private

CMS Certification Number521356

Location820 Arbutus AveOconto, WI 54153 · Oconto County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 54313 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

$163.24 typical visit price

range $53.90 – $163.24

Typical copayment $40.81 (range $13.47 – $40.81)

Most-billed visit code 99205

Established Patient

$95.41 typical visit price

range $17.40 – $133.76

Typical copayment $23.85 (range $4.35 – $33.44)

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.

Other Providers at the Same Location NPPES 20

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

DR. KEVIN L MORTARA MD

Internal Medicine (Hematology & Oncology)