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GREGORY HAMAN M.D.
NPI 1033590773
Internal Medicine in Willimantic, CT

Active since June 17, 2015PECOS EnrolledAccepts Medicare Assignment
93.56/100
CMS Quality Rating
5 FOUNDERS ST STE 100, WILLIMANTIC, CT 06226(860) 423-9764 Get Directions Write a Review

NPPES record last updated: May 6, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 6, 2020, Jun 27, 2018 (2 updates tracked since 2018).

About Gregory Haman M.d. NPPES

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

GREGORY HAMAN M.D. (NPI 1033590773) is an individual internal medicine provider in Willimantic, Connecticut, licensed in Connecticut (65062) and active in the NPI registry since June 2015. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Harvard Medical School (2015).

NPPES Registry Identity

NPI1033590773
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameGREGORY HAMANCredential: M.D.
Location Address5 FOUNDERS ST STE 100Willimantic, CT 06226-2049
Mailing Address1290 Silas Deane Hwy, Hhc Cvo Enrollment 1st FloorWethersfield, CT 06109
Phone(860) 423-9764
Sole ProprietorYes
Medical School CMSHarvard Medical SchoolGraduated 2015
Enumeration DateJune 17, 2015
Last NPPES UpdateMay 6, 20202 updates tracked since enumeration
NPPES CertifiedMay 6, 2020
✔ NPI 1033590773 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in CT · 65062✔ Licensed in IL · 125066888
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.
5 FOUNDERS ST STE 100, Willimantic, CT 06226
Open in Google Maps ↗

Secondary Practice Locations 2

Location 15841 S Maryland Ave, Room A700; MC-7082Chicago, IL 60637-1447 · Phone (773) 702-6840
Location 2Cermak Health Services of Cook County, 2800 South California AvenueChicago, IL 60608-5107 · Phone (773) 674-7488

Other Identifiers 1

Other65062CT · Ct Lic

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

Gregory Haman 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 ID2961702964
PECOS Enrollment IDI20200508001093
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

5

Medicare enrollment records show Gregory Haman reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Natchaug Hospital, Inc.
2.2 mi
Psychiatric Hospital
189 STORRS ROAD
Mansfield Center, CT 06250
  • Reassigned Medicare billing, Connecticut enrollment
  • 200 clinicians in this Medicare group
NPI 1295811321 (860) 456-1311
William W Backus Hospital
14 mi
Psychiatric Unit
326 WASHINGTON ST
Norwich, CT 06360
  • Reassigned Medicare billing, Connecticut enrollment
  • 430 clinicians in this Medicare group
NPI 1730243536 (860) 889-8331
Hartford Healthcare Medical Group, Inc
23 mi
Surgery
1290 SILAS DEANE HWY, ATTN: LINDA STRAKA
Wethersfield, CT 06109
  • Reassigned Medicare billing, Connecticut enrollment
  • 747 clinicians in this Medicare group
NPI 1043561301 (860) 972-9033
Windham Community Memorial Hospital, Inc.
29 mi
General Acute Care Hospital
112 MANSFIELD AVE
Willimantic, CT 06226
  • Reassigned Medicare billing, Connecticut enrollment
  • 302 clinicians in this Medicare group
NPI 1023191467 (860) 456-6752
Rosebud Indian Health Service
1,460 mi
General Acute Care Hospital
400 SOLDIER CREEK ROAD
Rosebud, SD 57570
  • Reassigned Medicare billing, Texas enrollment
  • 386 clinicians in this Medicare group
NPI 1194757369 (605) 747-3245

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 10

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.
485 services181 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.
135 services135 patients
Hemoglobin a1c level 83036
Hemoglobin A1c (HbA1c) is a test that measures your average blood sugar level over the past 2-3 months. It's used to monitor how well diabetes is being controlled. High levels may indicate that your diabetes treatment plan needs adjustment.
79 services45 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.
76 services59 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
44 services44 patients
Influenza vaccine split virus, preservative free 90662
The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.
41 services41 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06226 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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

93.56/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality78.51
Promoting Interoperability100
Improvement Activities40

Referred Medical Equipment & Supplies CMS DME claims 4

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
3 suppliers12 claims35 services$6.48 avg. paid by Medicare
Nebulizer, with compressor E0570
DME-Other DME · category DE000N
2 suppliers11 claims11 services$7.76 avg. paid by Medicare
Albuterol, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose, 1 mg J7613
DME-Drugs Administered Through DME · category DG006N
1 supplier11 claims2,862 services$0.03 avg. paid by Medicare
Pharmacy dispensing fee for inhalation drug(s); per 30 days Q0513
DME-Other DME · category DE000N
2 suppliers12 claims12 services$19.49 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 7

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

DR. JUDITH CHINENYE UKABAM M.D.
Internal Medicine (Geriatric Medicine)
5 FOUNDERS ST STE 100
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 423-9764
SURAYDA JULISSA HERRERA D.O
Internal Medicine
5 FOUNDERS ST STE 100
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 423-9764
KATHYRN AMANDA KONOW
Physician Assistant
5 FOUNDERS ST STE 100
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (864) 239-7640
MADISON MCNALLY DAHM MSW, LCSW
Social Worker (Clinical)
5 FOUNDERS ST STE 100
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 423-9764
MAURICE EDWARD REYNOLDS FNP-C
Nurse Practitioner (Family)
5 FOUNDERS ST STE 100
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 423-9764
FRANCISCO JOSE REIS FERREIRA DE LIMA MD
Internal Medicine
5 FOUNDERS ST STE 100
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 423-9764
ANA PAULA PINTO COPETTI
Internal Medicine
5 FOUNDERS ST STE 100
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 423-9764

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 Gregory Haman's NPI number?

The NPI number for Gregory Haman is 1033590773. It was assigned to this individual provider in the NPPES registry on June 17, 2015.

Where is Gregory Haman located?

Gregory Haman practices at 5 Founders St Ste 100, Willimantic, CT 06226. The listed phone number is (860) 423-9764.

What is Gregory Haman's specialty?

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

Is Gregory Haman enrolled in Medicare?

Yes. Gregory Haman 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 Gregory Haman's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Haman reassigns Medicare benefits to 5 organizations: Natchaug Hospital, Inc. (Mansfield Center, CT), William W Backus Hospital (Norwich, CT), Hartford Healthcare Medical Group, Inc (Wethersfield, CT), Windham Community Memorial Hospital, Inc. (Willimantic, CT) and Rosebud Indian Health Service (Rosebud, SD). 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 Gregory Haman's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Haman accept?

Health plans from Anthem Blue Cross and Blue Shield list Gregory Haman 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 Gregory Haman was last updated on May 6, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.