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GREEN SPRING INTERNAL MEDICINE, LLC
NPI 1558310490
Internal Medicine in Lutherville, MD

Active since May 09, 2006CLIA 21D1067055 · Waiver
2360 W JOPPA RD, SUITE 210, LUTHERVILLE, MD 21093(410) 583-2890(410) 583-2891 Get Directions Write a Review

NPPES record last updated: July 21, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 21, 2022, Aug 22, 2020 (2 updates tracked since 2020).

About Green Spring Internal Medicine, Llc NPPES

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

GREEN SPRING INTERNAL MEDICINE, LLC (NPI 1558310490) is a healthcare organization registered as an internal medicine in Lutherville, Maryland and active in the NPI registry since May 2006. The organization holds a CLIA Waiver certificate valid through April 9, 2027 and lists Holly R. Dahlman, Member, as its authorized official.

NPPES Registry Identity

NPI1558310490
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameGREEN SPRING INTERNAL MEDICINE, LLC
Location Address2360 W JOPPA RD, SUITE 210Lutherville, MD 21093-4624
Mailing Address2360 W Joppa Rd, Suite 210Lutherville, MD 21093-4624 · (410) 583-2890 · Fax (410) 583-2891
Phone(410) 583-2890
Fax(410) 583-2891
Organization SubpartNo
Authorized OfficialHolly R. DahlmanMember · (410) 608-8964
Enumeration DateMay 9, 2006
Last NPPES UpdateJuly 21, 20222 updates tracked since enumeration
✔ NPI 1558310490 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MD · D0054653
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.
2360 W JOPPA RD, Lutherville, MD 21093
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE 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)

Green Spring Internal Medicine, Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

4

Medicare enrollment records show 4 clinicians reassign Medicare billing to Green Spring Internal Medicine, LLC, which bills Medicare for the services they deliver. Of these, 3 practice at this address. They are listed nearest first.

Clinicians, nearest first (4)

Holly Dahlman, M.D.
Internal Medicine
NPI 1962464552
2360 W JOPPA RD GREEN SPRING INTERNAL MEDICINE, LLC - SUITE 210
Lutherville, MD 21093
(410) 583-2890
✔ PECOS✔ Accepts MedicareSame address
Zachary Nayak
Pediatric Medicine
NPI 1861782187
2360 W JOPPA RD STE 210
Lutherville, MD 21093
(410) 583-2890
✔ PECOS✔ Accepts MedicareSame address
Michael Brady, M.D.
Internal Medicine
NPI 1932561172
2360 W JOPPA RD STE 210
Timonium, MD 21093
(410) 583-2890
✔ PECOSSame address
Marie-Alberte Boursiquot, M.D
Internal Medicine
NPI 1578571618
4801 DORSEY HALL DR STE 201
Ellicott City, MD 21042
(410) 997-7660
✔ PECOS✔ Accepts Medicare15 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 21D1067055

Green Spring Internal Medicine · Lutherville, MD
Active · expires Apr 9, 2027
CLIA Number21D1067055
Laboratory TypePhysician Office
Certificate Effective DateApril 10, 2025
Certificate Expiration DateApril 9, 2027
Laboratory DirectorHolly R. Dahlman
Laboratory Phone(410) 583-2890
Laboratory LocationGreen Spring Internal Medicine2360 W Joppa Rd Suite 210, Lutherville, MD 21093
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 Green Spring Internal Medicine, LLC's NPI number?

The NPI number for Green Spring Internal Medicine, LLC is 1558310490. It was assigned to this organization in the NPPES registry on May 9, 2006.

Where is Green Spring Internal Medicine, LLC located?

Green Spring Internal Medicine, LLC is located at 2360 W Joppa Rd Suite 210, Lutherville, MD 21093. The listed phone number is (410) 583-2890.

What is Green Spring Internal Medicine, LLC's specialty?

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

Is Green Spring Internal Medicine, LLC enrolled in Medicare?

Yes. Green Spring Internal Medicine, LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Green Spring Internal Medicine, LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 4 clinicians in 2 Medicare specialties reassign their Medicare billing to Green Spring Internal Medicine, LLC. 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. The largest specialties are Internal Medicine (3) and Pediatric Medicine (1). Of these, 3 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Green Spring Internal Medicine, LLC hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 21D1067055) is associated with this NPI, valid through April 9, 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 Green Spring Internal Medicine, LLC was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.