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

Q: 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.

Q: What is Nan Lan's specialty?

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

Q: 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 2 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.

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: October 18, 2026.

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

On this page

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

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 (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.

Medicare Billing Reassignment

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

Brigham & Womens Physicians Organization Inc

Same address

Internal Medicine

75 FRANCIS ST
Boston, MA 02115

Reassigned Medicare billing, Massachusetts enrollment
4,574 clinicians in this Medicare group

NPI 1033535497 (617) 732-5500

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 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

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

LARA COAKLEY

Nurse Practitioner (Family)

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.

Which organization bills Medicare for Nan Lan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nan Lan reassigns Medicare benefits to Brigham & Womens Physicians Organization Inc (Boston, MA). 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 Nan Lan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Nan Lan accept?

Health plans from Anthem Blue Cross and Blue Shield list Nan Lan 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 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 2 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.