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MJM MEDICINE PC
NPI 1801682455
Internal Medicine in Greenwich, CT

Active since April 18, 2025CLIA 07D2329107 · Waiver
42 SHERWOOD PL, GREENWICH, CT 06830(203) 869-0502 Get Directions Write a Review

NPPES record last updated: June 11, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Mjm Medicine Pc NPPES

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

MJM MEDICINE PC (NPI 1801682455) is a healthcare organization registered as an internal medicine in Greenwich, Connecticut and active in the NPI registry since April 2025. The organization holds a CLIA Waiver certificate valid through August 21, 2027 and lists Michael Liu, President, as its authorized official.

NPPES Registry Identity

NPI1801682455
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameMJM MEDICINE PC
Location Address42 SHERWOOD PLGreenwich, CT 06830
Mailing Address1 Ironwood LnDarien, CT 06820-2812 · (207) 240-8827
Phone(203) 869-0502
Organization SubpartNo
Authorized OfficialMichael LiuPresident · (207) 240-8827
Enumeration DateApril 18, 2025
Last NPPES UpdateJune 11, 2025
NPPES CertifiedJune 11, 2025
✔ NPI 1801682455 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
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.
42 SHERWOOD PL, Greenwich, CT 06830
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Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mjm Medicine Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Mjm Medicine PC, which bills Medicare for the services they deliver. Of these, 1 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Maxwell Bressman, M.D.
Hospitalist
NPI 1578094876
5 PERRYRIDGE RD
Greenwich, CT 06830
(038) 633-9722
✔ PECOS✔ Accepts Medicare0.2 mi
Michael Liu, M.D.
Internal Medicine
NPI 1376735662
222 E 19TH ST APT 4A
New York, NY 10003
(212) 677-2758
✔ PECOS28 mi

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 07D2329107

Mjm Medicine PC · Greenwich, CT
Active · expires Aug 21, 2027
CLIA Number07D2329107
Laboratory TypePhysician Office
Certificate Effective DateAugust 22, 2025
Certificate Expiration DateAugust 21, 2027
Laboratory DirectorMichael Liu
Laboratory Phone(203) 869-0502
Laboratory LocationMjm Medicine PC42 Sherwood Place, Greenwich, CT 06830
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

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 Mjm Medicine PC's NPI number?

The NPI number for Mjm Medicine PC is 1801682455. It was assigned to this organization in the NPPES registry on April 18, 2025.

Where is Mjm Medicine PC located?

Mjm Medicine PC is located at 42 Sherwood Pl, Greenwich, CT 06830. The listed phone number is (203) 869-0502.

What is Mjm Medicine PC's specialty?

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

Is Mjm Medicine PC enrolled in Medicare?

Yes. Mjm Medicine PC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Mjm Medicine PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Mjm Medicine PC, in Hospitalist and Internal Medicine. A 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 the clinician's services. Of these, 1 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Mjm Medicine PC hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 07D2329107) is associated with this NPI, valid through August 21, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Mjm Medicine PC was last updated on June 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.