Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. GREGORY K. JOHNSON M.D.
NPI 1922049402
Specialist in Haverhill, MA

Active since June 08, 2006PECOS Enrolled
288 GROVELAND ST, HAVERHILL, MA 01830(978) 373-3851(978) 521-6542 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

  • Individual
  • Male
  • Years of Experience 43
  • Specialist
  • Accepts Insurance
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About GREGORY JOHNSON

This page provides the complete NPI Profile along with additional information for Gregory Johnson, a provider established in Haverhill, Massachusetts with a medical specialization in Specialist and more than 43 years of experience. He graduated from Columbia University College Of Physicians And Surgeons in 1984. The healthcare provider is registered in the NPI registry with number 1922049402 assigned on June 2006. The practitioner's primary taxonomy code is 174400000X with license number 76547 (MA). The provider is registered as an individual and his NPI record was last updated July 2026.

NPI
1922049402
Provider Name
DR. GREGORY K. JOHNSON M.D.
Gender
Male
Entity Type
Individual
Location Address
288 GROVELAND ST HAVERHILL, MA 01830
Location Phone
(978) 373-3851
Location Fax
(978) 521-6542
Mailing Address
288 GROVELAND ST HAVERHILL, MA 01830
Mailing Phone
(978) 373-3851
Mailing Fax
(978) 521-6542
Medical School Name
COLUMBIA UNIVERSITY COLLEGE OF PHYSICIANS AND SURGEONS
Graduation Year
1984
Is Sole Proprietor?
No
Enumeration Date
06-08-2006
Last Update Date
07-13-2026
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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Specialist

Taxonomy Code
174400000X
Type
Other Service Providers
License No.
76547
License State
MA
Taxonomy Description
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.

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

  • WellSense Clarity NH Bronze 6500 HSA + $0 Rx List + 24/7 Nurse Advice - HMO
  • WellSense Clarity NH Bronze 7500 HSA + $0 Rx List + 24/7 Nurse Advice - HMO
  • WellSense Clarity NH Bronze 7600 HSA + $0 Rx List + 24/7 Nurse Advice - HMO
  • WellSense Clarity NH Gold 2000 + $0 Rx List + 24/7 Nurse Advice - HMO
  • WellSense Clarity NH Silver 0 Deductible + $0 Rx List + 24/7 Nurse Advice - HMO
  • WellSense Clarity NH Silver 3400 + $0 Rx List + 24/7 Nurse Advice - HMO
  • WellSense Clarity NH Silver 6000 + $0 Rx List + 24/7 Nurse Advice - HMO

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier Type / Code Identifier State Identifier Issuer
3097391MEDICAID (05)MA 

Medicare Participation & PECOS Enrollment Status

Gregory Johnson is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Gregory Johnson is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 547209660

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20050428000384

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Provider Referred Orders for Durable Medical Equipment, Devices & Supplies

The following list reflects the services, supplies or durable medical equipment ordered by this provider to a DME supplier on behalf of patients. The information below is derived from Medicare claims data and reflects the BETOS category, HCPCS code information and the number times each service was submitted under the Medicare fee-for-service program.

Orthotic Devices

  • DME-Orthotic Devices (DF011N)

    Knee orthosis, elastic with condylar pads and joints, with or without patellar control, prefabricated, includes fitting and adjustment (HCPCS:L1820)

    2 DME suppliers used 11 Medicare Claims 11 Services Paid

  • DME-Orthotic Devices (DF003N)

    Walking boot, pneumatic and/or vacuum, with or without joints, with or without interface material, prefabricated, off-the-shelf (HCPCS:L4361)

    2 DME suppliers used 12 Medicare Claims 12 Services Paid

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Application of nonmoveable forearm to hand splint

The application of a non-moveable forearm to hand splint is a procedure where a rigid support is placed on your forearm and hand. This is done to stabilize the area, promote healing, and prevent further injury. It restricts movement, providing rest to the injured part.

This service was performed 33 times for 27 patients

Aspiration and/or injection of fluid from large joint

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.

This service was performed 86 times for 55 patients

Cast supplies, short arm splint, adult (11 years +), fiberglass

A short arm splint, for adults and children aged 11+, is a support device made of fiberglass. It is applied to the lower part of the arm to immobilize it after an injury or surgery. It helps in healing by restricting movement and providing stability.

This service was performed 35 times for 27 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

This service was performed 43 times for 39 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more

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.

This service was performed 95 times for 74 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more

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.

This service was performed 173 times for 119 patients

Injection into tendon or ligament

An injection into a tendon or ligament involves placing medication directly into these areas to help reduce inflammation and pain. It's often used for conditions like arthritis or tendonitis. The procedure is quick and usually involves a local anesthetic.

This service was performed 20 times for 14 patients

Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg

This injection contains two medications, betamethasone acetate and betamethasone sodium phosphate. It is used to reduce inflammation and pain. It's given by a healthcare professional, often directly into the area causing discomfort.

This service was performed 355 times for 73 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more

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.

This service was performed 18 times for 18 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

This service was performed 34 times for 34 patients

Placement of strapping to hand or finger

Strapping to the hand or finger is a procedure where a medical-grade tape is applied to support injured or weak areas. This helps reduce pain, enhance movement, and prevent further injury. It's commonly used for conditions like sprains or arthritis.

This service was performed 14 times for 11 patients

X-ray of hand, minimum of 3 views

An X-ray of the hand, minimum of 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the bones in your hand from different angles. This helps in diagnosing fractures, infections, arthritis, or other abnormalities. It's quick and painless.

This service was performed 34 times for 29 patients

X-ray of hip, 2-3 views

An X-ray of the hip with 2-3 views is a non-invasive imaging test. It uses a small amount of radiation to produce pictures of the hip joint. These images help in diagnosing conditions like fractures, arthritis, or other abnormalities. The process is quick and painless.

This service was performed 16 times for 14 patients

X-ray of knee, 3 views

An X-ray of the knee, 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the knee from three different angles. This helps medical professionals to diagnose and monitor conditions like arthritis, fractures, or infections. The process is quick and painless.

This service was performed 43 times for 36 patients

X-ray of knee, 4 or more views

An X-ray of the knee, 4 or more views, is a non-invasive imaging test. It involves capturing multiple images of your knee from different angles. This helps in diagnosing conditions such as fractures, arthritis, or infections. The procedure is quick and painless.

This service was performed 37 times for 30 patients

X-ray of shoulder, minimum of 2 views

An X-ray of the shoulder, with a minimum of 2 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of your shoulder bones. This helps in diagnosing conditions like fractures, arthritis, or other abnormalities. The procedure is quick and painless.

This service was performed 12 times for 12 patients

X-ray of wrist, minimum of 3 views

An X-ray of the wrist, minimum of 3 views, is a diagnostic procedure that uses radiation to create images of your wrist from different angles. This helps detect fractures, infections, or other abnormalities for accurate diagnosis and treatment planning.

This service was performed 43 times for 28 patients

Find Provider Hospital Affiliations - Privileges

Doctors and physicians must apply for hospital privileges to treat patients at hospitals. Find out if your doctor has privileges to practice at your preferred hospital by using the hospital affiliation information below based on recent medical claims.

Hospital affiliation is identified through self-reporting data, inpatient, outpatient, physician and ancillary service claims linked by the medical claims NPI number and place of service code. Additionally, to further determine provider hospital affiliation the clinician must have provided services to at least three patients on three different dates in the last 12 months. Gregory Johnson is affiliated with the following medical facilities:

Hospital Name Address Phone Hospital Type Overall Rating
LAWRENCE GENERAL HOSPITALONE GENERAL STREET
LAWRENCE, MA 01842
(978) 683-4000Acute Care Hospitals
NORTH SHORE MEDICAL CENTER -81 HIGHLAND AVENUE
SALEM, MA 01970
(978) 741-1215Acute Care Hospitals

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NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1922049402, we treat the final digit (2) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 58. The final step is to find the difference between that total and the next multiple of ten (60 - 58 = 2).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
9
Unchanged
Pos 3
2
Doubled → 4
Pos 4
2
Unchanged
Pos 5
0
Doubled → 0
Pos 6
4
Unchanged
Pos 7
9
Doubled → 18 → 1 + 8
Pos 8
4
Unchanged
Pos 9
0
Doubled → 0
Check
2
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 2 → 4 0 → 0 9 → 18 → 9 0 → 0

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 9 + 4 + 2 + 0 + 4 + 1 + 8 + 4 + 0 + 24 = 58

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 58 is 60. The difference is the calculated check digit.

60 - 58 = 2
This NPI is valid
The calculated check digit is 2, which matches the last digit of 1922049402.

Other Providers at the Same Location


The following 17 providers are registered at the same or a nearby location.

Psychiatry & Neurology (Geriatric Psychiatry)
288 GROVELAND ST, SUITE C2
HAVERHILL, MA 01830
Specialist
288 GROVELAND ST
HAVERHILL, MA 01830
Urology
288 GROVELAND ST
HAVERHILL, MA 01830
Physician Assistant (Medical)
288 GROVELAND ST
HAVERHILL, MA 01830
Chiropractor
288 GROVELAND ST, SUITE C2
HAVERHILL, MA 01830
Chiropractor
288 GROVELAND ST, SUITE C2
HAVERHILL, MA 01830
Psychiatry & Neurology (Psychiatry)
288 GROVELAND ST, C2
HAVERHILL, MA 01830
Specialist
288 GROVELAND ST
HAVERHILL, MA 01830
Dentist
288 GROVELAND ST
HAVERHILL, MA 01830
Specialist
288 GROVELAND ST
HAVERHILL, MA 01830
Pediatrics
288 GROVELAND ST, UNIT C-3
HAVERHILL, MA 01830
Durable Medical Equipment & Medical Supplies
288 GROVELAND ST
HAVERHILL, MA 01830
Orthopaedic Surgery (Sports Medicine)
288 GROVELAND ST
HAVERHILL, MA 01830
Physician Assistant (Surgical)
288 GROVELAND ST
HAVERHILL, MA 01830
Physician Assistant (Surgical)
288 GROVELAND ST
HAVERHILL, MA 01830
Orthopaedic Surgery (Hand Surgery)
288 GROVELAND ST
HAVERHILL, MA 01830
Orthopaedic Surgery
288 GROVELAND ST
HAVERHILL, MA 01830

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1922049402, enumerated as an "individual" on June 08, 2006.

The provider is located at 288 GROVELAND ST HAVERHILL, MA 01830 and the phone number is (978) 373-3851.

Specialist with taxonomy code 174400000X.

The provider might be accepting Accepts: WellSense Health Plan, Medicare and Medicaid. Please consult your insurance carrier or call the provider to verify.

Gregory Johnson is affiliated with: LAWRENCE GENERAL HOSPITAL and NORTH SHORE MEDICAL CENTER -.