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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.

ASSOCIATES IN DERMATOLOGY, LLC
NPI 1144387390
Dermatology in Watertown, MA

Active since January 03, 2007CLIA 22D0956834 · Waiver
40 SPRING ST, WATERTOWN, MA 02472(617) 923-8433 Get Directions Write a Review

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

Record update history: Oct 6, 2026, Jan 30, 2017, Feb 2, 2016 and 1 more (4 updates tracked since 2015).

About Associates In Dermatology, Llc NPPES

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

ASSOCIATES IN DERMATOLOGY, LLC (NPI 1144387390) is a healthcare organization registered as a dermatology in Watertown, Massachusetts and active in the NPI registry since January 2007. The organization holds a CLIA Waiver certificate valid through October 31, 2026 and lists Samuel D Goos, Managing Partner, as its authorized official.

NPPES Registry Identity

NPI1144387390
Entity TypeOrganization
Primary Taxonomy207N00000X
Legal Business NameASSOCIATES IN DERMATOLOGY, LLC
Location Address40 SPRING STWatertown, MA 02472-3474
Mailing Address526 Main St Ste 302Acton, MA 01720-3310 · (978) 371-7010 · Fax (978) 371-0522
Phone(617) 923-8433
Organization SubpartNo
Authorized OfficialSamuel D GoosManaging Partner · (978) 371-7010
Enumeration DateJanuary 3, 2007
Last NPPES UpdateOctober 6, 20264 updates tracked since enumeration
NPPES CertifiedOctober 6, 2026
✔ NPI 1144387390 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyDermatologyAllopathic & Osteopathic Physicians
Taxonomy Code207N00000X
Definition
A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.
Also ListedDermatology · MOHS-Micrographic SurgeryTaxonomy 207ND0101X
Also ListedDermatology · DermatopathologyTaxonomy 207ND0900X
Also ListedPathology · Anatomic Pathology & Clinical PathologyTaxonomy 207ZP0102X
40 SPRING ST, Watertown, MA 02472
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Other Identifiers 3

Other618241MA · Tufts
OtherM17145MA · Blue Shield Grp #
OtherCH1872MA · Railroad Medicare

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Associates In Dermatology, 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 Associates In Dermatology, LLC, which bills Medicare for the services they deliver. Of these, 2 practice at this address. They are listed nearest first.

Clinicians, nearest first (4)

Margaret Schwarz, MD
Dermatology
NPI 1669822219
40 SPRING ST
Watertown, MA 02472
(617) 923-8433
✔ PECOS✔ Accepts MedicareSame address
Haoming Xu
Dermatology
NPI 1134623549
40 SPRING ST
Watertown, MA 02472
(617) 923-8433
✔ PECOS✔ Accepts MedicareSame address
James Liou, M.D.
Dermatology
NPI 1609098136
128 CARNEGIE ROW STE 202
Norwood, MA 02062
(781) 762-5858
✔ PECOS✔ Accepts Medicare14 mi
Amanda Auerbach, M.D.
Dermatology
NPI 1558592261
281 LINCOLN ST
Worcester, MA 01605
(508) 334-5962
✔ PECOS✔ Accepts Medicare32 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 22D0956834

Associates In Dermatology LLC · Watertown, MA
Active · expires Oct 31, 2026
CLIA Number22D0956834
Laboratory TypePhysician Office
Certificate Effective DateNovember 1, 2024
Certificate Expiration DateOctober 31, 2026
Laboratory DirectorDr. Margaret Schwarz
Laboratory Phone(617) 925-5541
Laboratory LocationAssociates In Dermatology LLC40 Spring Street, Watertown, MA 02472
CLIA data matches this NPI record on: Address Name
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 Associates In Dermatology, LLC's NPI number?

The NPI number for Associates In Dermatology, LLC is 1144387390. It was assigned to this organization in the NPPES registry on January 3, 2007.

Where is Associates In Dermatology, LLC located?

Associates In Dermatology, LLC is located at 40 Spring St, Watertown, MA 02472. The listed phone number is (617) 923-8433.

What is Associates In Dermatology, LLC's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Is Associates In Dermatology, LLC enrolled in Medicare?

Yes. Associates In Dermatology, LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Associates In Dermatology, LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 4 clinicians, all in Dermatology, reassign their Medicare billing to Associates In Dermatology, 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. Of these, 2 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Associates In Dermatology, LLC hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 22D0956834) is associated with this NPI, valid through October 31, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

What insurance does Associates In Dermatology, LLC accept?

Health plans from Anthem Blue Cross and Blue Shield list Associates In Dermatology, LLC 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 Associates In Dermatology, LLC was last updated on October 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 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.