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MR. IAN FERNANDO GUILLEN ALVAREZ MD
NPI 1801465166
Internal Medicine in Bridgeport, CT

Active since June 22, 2021PECOS EnrolledAccepts Medicare Assignment
2800 MAIN STREET, DEPT OF MEDICINE, BRIDGEPORT, CT 06606(475) 210-5791(475) 210-5022 Get Directions Write a Review

NPPES record last updated: June 12, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 12, 2024, Nov 3, 2022, Jul 1, 2021 and 1 more (4 updates tracked since 2021).

About Mr. Ian Fernando Guillen Alvarez Md NPPES

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

MR. IAN FERNANDO GUILLEN ALVAREZ MD (NPI 1801465166) is an individual internal medicine provider in Bridgeport, Connecticut, licensed in Connecticut (76275) and active in the NPI registry since June 2021. He is enrolled in Medicare PECOS and is a graduate of Other (2017).

NPPES Registry Identity

NPI1801465166
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameMR. IAN FERNANDO GUILLEN ALVAREZCredential: MD
Location Address2800 MAIN STREET, DEPT OF MEDICINEBridgeport, CT 06606
Mailing Address2800 Main Street, Dept Of MedicineBridgeport, CT 06606
Phone(475) 210-5791
Fax(475) 210-5022
Sole ProprietorNo
Medical School CMSOtherGraduated 2017
Enumeration DateJune 22, 2021
Last NPPES UpdateJune 12, 20244 updates tracked since enumeration
NPPES CertifiedJune 12, 2024
✔ NPI 1801465166 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 CT · 76275
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
2800 MAIN STREET, Bridgeport, CT 06606
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.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

Mr. Ian Fernando Guillen Alvarez Md 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 ID941743454
PECOS Enrollment IDI20240625000480
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 Ian Guillen Alvarez reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Hartford Healthcare Medical Group Specialists, PLLC
47 mi
Surgery
85 SEYMOUR ST STE 415
Hartford, CT 06106
  • Reassigned Medicare billing, Connecticut enrollment
  • 1,921 clinicians in this Medicare group
NPI 1023584216 (860) 246-2071

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.

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.
150 services85 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.
92 services40 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.
48 services46 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06606 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.

PRIYANSHI ASHOKBHAI JOSHI MBBS
Student in an Organized Health Care Education/Training Program
2800 MAIN STREET
BRIDGEPORT, CT 06606
Greater Bridgeport Planning Region (203) 576-6000
KELLY TAKACS
Nurse Anesthetist, Certified Registered
2800 MAIN STREET, SAINT VINCENTS MEDICAL CENTER
BRIDGEPORT, CT 06606
Greater Bridgeport Planning Region (203) 929-7353
MUHAMMAD HAMZA AKHTAR MD
Student in an Organized Health Care Education/Training Program
2800 MAIN STREET, DEPT OF MEDICINE
BRIDGEPORT, CT 06606
Greater Bridgeport Planning Region (475) 210-5425
NIKITHA KARKALA
Student in an Organized Health Care Education/Training Program
2800 MAIN STREET, DEPARTMENT OF MEDICINE
BRIDGEPORT, CT 06606
Greater Bridgeport Planning Region (475) 210-5791
MS. KRISHNA SINGH M.B.B.S
Student in an Organized Health Care Education/Training Program
2800 MAIN STREET, DEPARTMENT OF MEDICAL EDUCATION
BRIDGEPORT, CT 06606
Greater Bridgeport Planning Region (475) 210-5425
MR. PHENYO VICTOR PHUU M.D.
Student in an Organized Health Care Education/Training Program
2800 MAIN STREET, DEPARTMENT OF MEDICAL EDUCATION
BRIDGEPORT, CT 06606
Greater Bridgeport Planning Region (475) 210-5440
MR. MAHEEP CHOWDARY ACHANTA MBBS
Student in an Organized Health Care Education/Training Program
2800 MAIN STREET, DEPARTMENT OF MEDICAL EDUCATION
BRIDGEPORT, CT 06606
Greater Bridgeport Planning Region (475) 210-4930
RAVINDERJEET KAUR PUAR M.B.B.S.
Student in an Organized Health Care Education/Training Program
2800 MAIN STREET, DEPARTMENT OF MEDICAL EDUCATION
BRIDGEPORT, CT 06606
Greater Bridgeport Planning Region (475) 210-5440

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 Ian Guillen Alvarez's NPI number?

The NPI number for Ian Guillen Alvarez is 1801465166. It was assigned to this individual provider in the NPPES registry on June 22, 2021.

Where is Ian Guillen Alvarez located?

Ian Guillen Alvarez practices at 2800 Main Street Dept Of Medicine, Bridgeport, CT 06606. The listed phone number is (475) 210-5791.

What is Ian Guillen Alvarez's specialty?

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

Is Ian Guillen Alvarez enrolled in Medicare?

Yes. Ian Guillen Alvarez 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 organization bills Medicare for Ian Guillen Alvarez's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ian Guillen Alvarez reassigns Medicare benefits to Hartford Healthcare Medical Group Specialists, PLLC (Hartford, CT). 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 Ian Guillen Alvarez's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ian Guillen Alvarez accept?

Health plans from Anthem Blue Cross and Blue Shield list Ian Guillen Alvarez as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Ian Guillen Alvarez was last updated on June 12, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.