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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

HARSHARAN K SIDHU MD
NPI 1144889189
Internal Medicine in Danbury, CT

Active since June 12, 2019PECOS Enrolled
120 MAIN ST, DANBURY, CT 06810(203) 743-9760 Get Directions Write a Review

NPPES record last updated: October 3, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 3, 2026, Nov 1, 2022, Jun 12, 2019 (3 updates tracked since 2019).

About Harsharan K Sidhu Md NPPES

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

HARSHARAN K SIDHU MD (NPI 1144889189) is an individual internal medicine provider in Danbury, Connecticut, licensed in California (A177244) and active in the NPI registry since June 2019. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1144889189
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameHARSHARAN K SIDHUCredential: MD
Location Address120 MAIN STDanbury, CT 06810-7834
Mailing Address2720 Mira Vista DrModesto, CA 95356-8798
Phone(203) 743-9760
Sole ProprietorNo
Enumeration DateJune 12, 2019
Last NPPES UpdateOctober 3, 20263 updates tracked since enumeration
NPPES CertifiedOctober 3, 2026
✔ NPI 1144889189 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A177244
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
120 MAIN ST, Danbury, CT 06810
Open in Google Maps ↗

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Harsharan K Sidhu Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Reassignment

Medicare enrollment records show Harsharan Sidhu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Permanente Medical Group Inc
2,528 mi
Internal Medicine
7373 WEST LANE
Stockton, CA 95210
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1548343510 (209) 476-2000

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06810 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
$138.84 typical visit price
range $60.82 – $183.10
Typical copayment $34.71 (range $15.20 – $45.77)
Most-billed visit code 99204
Established Patient
$106.68 typical visit price
range $19.76 – $149.26
Typical copayment $26.67 (range $4.94 – $37.31)
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. DAVID LOUISIA MD
Internal Medicine
120 MAIN ST
DANBURY, CT 06810
Western Connecticut Planning Region (203) 743-0100
DODIE HEREDIA MD
Student in an Organized Health Care Education/Training Program
120 MAIN ST
DANBURY, CT 06810
Western Connecticut Planning Region (203) 743-9760
DR. ISMAEL HERNANDEZ COLON MD
Student in an Organized Health Care Education/Training Program
120 MAIN ST
DANBURY, CT 06810
Western Connecticut Planning Region (203) 743-9760
DR. MERYL AMY HERTZ DDS
Dentist
120 MAIN ST
DANBURY, CT 06810
Western Connecticut Planning Region (203) 743-9760
JAYA KUMARI M.D.
Student in an Organized Health Care Education/Training Program
120 MAIN ST, 3RD FLOOR
DANBURY, CT 06810
Western Connecticut Planning Region (203) 456-1406
DYLAN EDELBAUM
Student in an Organized Health Care Education/Training Program
120 MAIN ST
DANBURY, CT 06810
Western Connecticut Planning Region (203) 743-9760
SANIYA SINGH DO
Student in an Organized Health Care Education/Training Program
120 MAIN ST
DANBURY, CT 06810
Western Connecticut Planning Region (203) 743-9760
SYED RAHMAN MD
Student in an Organized Health Care Education/Training Program
120 MAIN ST
DANBURY, CT 06810
Western Connecticut Planning Region (203) 743-0100

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 Harsharan Sidhu's NPI number?

The NPI number for Harsharan Sidhu is 1144889189. It was assigned to this individual provider in the NPPES registry on June 12, 2019.

Where is Harsharan Sidhu located?

Harsharan Sidhu practices at 120 Main St, Danbury, CT 06810. The listed phone number is (203) 743-9760.

What is Harsharan Sidhu's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Harsharan Sidhu enrolled in Medicare?

Yes. Harsharan Sidhu is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Harsharan Sidhu's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Harsharan Sidhu reassigns Medicare benefits to Permanente Medical Group Inc (Stockton, CA). The 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 Harsharan Sidhu'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 Harsharan Sidhu was last updated on October 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 days 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.