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STEPHEN L. SIMPSON M.D.
NPI 1154322964
Specialist in Ayer, MA

Active since August 02, 2005PECOS Enrolled
198 GROTON RD, SUITE 1, AYER, MA 01432(978) 862-0025(978) 862-0049 Get Directions Write a Review

NPPES record last updated: May 14, 2008. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Stephen L. Simpson M.d. NPPES

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

STEPHEN L. SIMPSON M.D. (NPI 1154322964) is an individual specialist in Ayer, Massachusetts, licensed in Massachusetts (205051) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1154322964
Entity TypeIndividualMale
Primary Taxonomy174400000X
Provider Legal NameSTEPHEN L. SIMPSONCredential: M.D.
Location Address198 GROTON RD, SUITE 1Ayer, MA 01432-1177
Mailing Address198 Groton Rd, Suite 1Ayer, MA 01432-1177 · (978) 862-0025 · Fax (978) 862-0049
Phone(978) 862-0025
Fax(978) 862-0049
Sole ProprietorYes
Enumeration DateAugust 2, 2005
Last NPPES UpdateMay 14, 2008
✔ NPI 1154322964 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
License✔ Licensed in MA · 205051
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
198 GROTON RD, Ayer, MA 01432
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Other Identifiers 12

Other0900631United Health
Medicaid0101877MA
Other6919759006MA · Cigna
Medicare NSC5434530001MA
OtherJ22501MA · Bcbs
Medicare ID-Type UnspecifiedA31427MA
Other2430200MA · Aetna
Medicare UPIND74126MA
Other103355800MA · Acs
Other172414MA · Harvard Pilgrim
Other408251MA · Tufts
Other48317MA · Fallon

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Stephen L. Simpson M.d. 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 Stephen Simpson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Steward Medical Group, Inc
25 mi
Specialist
9 GALEN ST
Watertown, MA 02472
  • Reassigned Medicare billing, Massachusetts enrollment
  • 1,103 clinicians in this Medicare group
NPI 1629398219 (615) 467-4474

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

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Injection, triamcinolone acetonide, not otherwise specified, 10 mg J3301
Triamcinolone acetonide is a medication used to reduce inflammation in the body. It's given as a 10 mg injection for conditions like allergies, arthritis, or skin problems. The injection helps to decrease swelling, redness, and itching.
1,190 services61 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
215 services127 patients
Aspiration and/or injection of fluid from large joint 20610
This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.
95 services63 patients
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212
This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.
60 services52 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
45 services45 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
19 services17 patients

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.

Wrist hand orthosis, wrist extension control cock-up, non molded, prefabricated, off-the-shelf L3908
DME-Orthotic Devices · category DF000N
2 suppliers16 claims16 services$59.69 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 2

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

LONGWOOD ACADEMIC PHYSICIANS, LLC
Internal Medicine (Cardiovascular Disease)
198 GROTON RD, SUITE 2
AYER, MA 01432
Middlesex County (978) 772-3793
DR. STEPHEN L. SIMPSON, M.D., P.C.
Specialist
198 GROTON RD, SUITE 1
AYER, MA 01432
Middlesex County (978) 862-0025

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 Stephen Simpson's NPI number?

The NPI number for Stephen Simpson is 1154322964. It was assigned to this individual provider in the NPPES registry on August 2, 2005.

Where is Stephen Simpson located?

Stephen Simpson practices at 198 Groton Rd Suite 1, Ayer, MA 01432. The listed phone number is (978) 862-0025.

What is Stephen Simpson's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Stephen Simpson enrolled in Medicare?

Yes. Stephen Simpson is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Stephen Simpson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Simpson reassigns Medicare benefits to Steward Medical Group, Inc (Watertown, 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 Stephen Simpson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Stephen Simpson was last updated on May 14, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.