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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.

NAN LAN MD
NPI 1730642844
Internal Medicine - Gastroenterology in Boston, MA

Active since April 08, 2019PECOS Enrolled
75 FRANCIS ST, BOSTON, MA 02115(617) 732-6389 Get Directions Write a Review

NPPES record last updated: August 11, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Aug 11, 2026, Apr 8, 2019 (2 updates tracked since 2019).

About Nan Lan Md NPPES

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

NAN LAN MD (NPI 1730642844) is an individual gastroenterology provider in Boston, Massachusetts, licensed in Massachusetts (1027413) and active in the NPI registry since April 2019. She is enrolled in Medicare PECOS and maintains a secondary practice location in Boston.

NPPES Registry Identity

NPI1730642844
Entity TypeIndividualFemale
Primary Taxonomy207RG0100X
Provider Legal NameNAN LANCredential: MD
Location Address75 FRANCIS STBoston, MA 02115-6106
Mailing Address75 Francis StBoston, MA 02115-6106
Phone(617) 732-6389
Sole ProprietorNo
Enumeration DateApril 8, 2019
Last NPPES UpdateAugust 11, 20262 updates tracked since enumeration
NPPES CertifiedAugust 11, 2026
✔ NPI 1730642844 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in MA · 1027413
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
75 FRANCIS ST, Boston, MA 02115
Open in Google Maps ↗

Secondary Practice Location 1

Location 155 Fruit StBoston, MA 02114-2621 · Phone (617) 732-6389

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Nan Lan 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02115 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
$144.11 typical visit price
range $63.72 – $189.86
Typical copayment $36.02 (range $15.93 – $47.46)
Most-billed visit code 99204
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
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.

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Nebulizer, with compressor E0570
DME-Other DME · category DE000N
1 supplier11 claims11 services$6.32 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 20

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

RUMA RAJBHANDARI
Internal Medicine (Gastroenterology)
75 FRANCIS ST
BOSTON, MA 02115
Suffolk County (617) 525-6841
WENYA LINDA BI
Neurological Surgery
75 FRANCIS ST
BOSTON, MA 02115
Suffolk County (203) 645-9485
CHI YUEN CHAN M.D.
Student in an Organized Health Care Education/Training Program
75 FRANCIS ST
BOSTON, MA 02115
Suffolk County (617) 732-5500
JENNIFER MICHELLE THOMAS MD
Radiology (Diagnostic Radiology)
75 FRANCIS ST, DEPARTMENT OF RADIOLOGY
BOSTON, MA 02115
Suffolk County (617) 732-6248
GAURAV SHARMA M.D.
Surgery (Vascular Surgery)
75 FRANCIS ST, BRIGHAM AND WOMEN'S HOSPITAL
BOSTON, MA 02115
Suffolk County (951) 259-0890
DR. EUGENE RICHARDSON MD
Internal Medicine (Infectious Disease)
75 FRANCIS ST
BOSTON, MA 02115
Suffolk County (617) 732-8881
YEU-SHIN CINDY CHANG M.D., M.P.H.
Emergency Medicine
75 FRANCIS ST, BWH DEPT. OF EMERGENCY MEDICINE
BOSTON, MA 02115
Suffolk County (617) 732-8070
CARA L RICHARDS
Physician Assistant
75 FRANCIS ST
BOSTON, MA 02115
Suffolk County (617) 732-5500

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 Nan Lan's NPI number?

The NPI number for Nan Lan is 1730642844. It was assigned to this individual provider in the NPPES registry on April 8, 2019.

Where is Nan Lan located?

Nan Lan practices at 75 Francis St, Boston, MA 02115. The listed phone number is (617) 732-6389.

What is Nan Lan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Nan Lan enrolled in Medicare?

Yes. Nan Lan is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Nan Lan was last updated on August 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.