ABNER LOUISSAINT JR. MD, PHD
NPI 1124154950
Pathology - Anatomic Pathology & Clinical Pathology in Boston, MA
NPI Status: Active since February 26, 2007
Contact Information
MASSACHUSETTS GENERAL HOSPITAL
55 FRUIT STREET
BOSTON, MA
ZIP 02114
Phone: (617) 726-2967
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
- Individual
- Male
- Years of Experience 21
- Pathology
- Anatomic Pathology & Clinical Pathology
- Accepts Medicare Approved Payment
- PECOS Enrolled
About ABNER LOUISSAINT
This page provides the complete NPI Profile along with additional information for Abner Louissaint, a provider established in Boston, Massachusetts with a medical specialization in Pathology, focusing in anatomic pathology & clinical pathology and more than 21 years of experience. The healthcare provider is registered in the NPI registry with number 1124154950 assigned on February 2007. The practitioner's primary taxonomy code is 207ZP0102X with license number L-225010 (MA). The provider is registered as an individual and his NPI record was last updated May 2026.
- NPI
- 1124154950
- Provider Name
- ABNER LOUISSAINT JR. MD, PHD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET BOSTON, MA 02114
- Location Phone
- (617) 726-2967
- Mailing Address
- MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET BOSTON, MA 02114
- Mailing Phone
- (617) 726-2967
- Medical School Name
- OTHER
- Graduation Year
- 2005
- Is Sole Proprietor?
- No
- Enumeration Date
- 02-26-2007
- Last Update Date
- 05-15-2026
- Code Navigator
Location Map
Secondary Locations
- 75 Francis St
Boston, MA 02115
(617) 732-5500
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
Pathology Anatomic Pathology & Clinical Pathology
- Taxonomy Code
- 207ZP0102X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- L-225010
- License State
- MA
- Taxonomy Description
- A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
Medicare Participation & PECOS Enrollment Status
Abner Louissaint 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.
Abner Louissaint 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: 7517090723
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: I20100809000170
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
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.
Blood smear interpretation by physician with written report
Bone marrow, smear interpretation
Flow cytometry technique for dna or cell analysis, 16 or more markers
Flow cytometry technique for dna or cell analysis, 2 to 8 markers
Flow cytometry technique for dna or cell analysis, 9 to 15 markers
Genetic sequencing localization, each additional procedure
Genetic sequencing localization, initial procedure
Microscopic genetic analysis of tumor, manual
Pathology examination of tissue using a microscope, intermediate complexity
Preparation of tissue for examination by removing any calcium present
Special stained specimen slides to examine tissue including interpretation and report
Special stained specimen slides to examine tissue, each additional procedure
Special stained specimen slides to examine tissue, initial procedure
Surgical pathology consultation and report on referred slides prepared elsewhere
Blood smear interpretation is a lab test where your doctor examines a sample of your blood under a microscope. They look for abnormalities in your blood cells which can help diagnose various conditions. You'll receive a written report of the findings.
This service was performed 15 times for 14 patientsBone marrow smear interpretation is a procedure where a small sample of your bone marrow is taken and examined under a microscope. This helps doctors identify any abnormal cells or signs of diseases such as anemia, leukemia, or infections. It's a crucial step in diagnosing various blood disorders.
This service was performed 35 times for 34 patientsFlow cytometry is a method used to measure and analyze cells. It uses a beam of light to detect up to 16 or more markers on cells, helping to identify their type, function, or abnormalities. This technique aids in diagnosing various health conditions.
This service was performed 11 times for 11 patientsFlow cytometry is a technique that helps analyze your cells and DNA. It uses lasers to identify and sort cells based on their properties, marked by up to 8 different markers. This helps in diagnosing and monitoring various health conditions.
This service was performed 19 times for 18 patientsFlow cytometry is a technique used to measure physical and chemical characteristics of cells or particles. It can analyze multiple markers (9 to 15) on a cell, helping to identify its type and function. This process can also examine DNA within cells for any abnormalities.
This service was performed 29 times for 28 patientsGenetic sequencing localization is a process where specific regions of your DNA are identified and studied. If you're having additional procedures, it simply means that more areas of your DNA are being examined. This helps to understand your genetic makeup better and can assist in identifying potential health risks.
This service was performed 14 times for 12 patientsGenetic sequencing localization is a process to identify where specific genes are located in your DNA. During the initial procedure, a sample of your cells is collected, usually through a simple swab or blood test. This data is then analyzed to pinpoint the location of certain genes. This can help understand your genetic makeup and potential health risks.
This service was performed 25 times for 24 patientsMicroscopic genetic analysis of a tumor involves examining your tumor's genes under a microscope. This helps identify specific genetic changes in the tumor cells. This information can aid in diagnosing, predicting disease progression, and determining the most effective treatment options.
This service was performed 41 times for 31 patientsA pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.
This service was performed 73 times for 57 patientsThis procedure involves treating tissue samples to remove any calcium, which can interfere with the examination. The tissue is soaked in a special solution that safely dissolves the calcium, leaving the tissue intact for accurate analysis. This helps in making precise diagnoses.
This service was performed 34 times for 34 patientsSpecial stained specimen slides are used to examine tissue samples. This involves applying special dyes to the tissue, which helps to highlight certain features under a microscope. The findings are then interpreted and a report is provided. This can aid in diagnosing various health conditions.
This service was performed 60 times for 33 patientsSpecial stained specimen slides are used to analyze tissue in detail. In this process, extra procedures may be needed for a more thorough examination. These involve applying special stains to the tissue on slides, enhancing specific elements for closer study.
This service was performed 282 times for 35 patientsThis procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.
This service was performed 44 times for 44 patientsA surgical pathology consultation involves reviewing slides prepared at a different lab to confirm or clarify a diagnosis. It's a second opinion to ensure accuracy. A report with findings and interpretations is then provided for your doctor's reference.
This service was performed 23 times for 22 patientsPhysician Visit Costs
The typical physician office visit costs for Medicare beneficiaries in this area are: $36.02 for a new patient copayment and $27.79 for an established patient copayment.
The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.
For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.
The prices below reflect the costs for new and established patients in the 02114 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99204
- Average New Patient Price $144.11
- Minimum New Patient Price $63.72
- Maximum New Patient Price $189.86
- Average New Patient Copayment $36.02
- Minimum New Patient Copayment $15.93
- Maximum New Patient Copayment $47.46
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99214
- Average Established Patient Price $111.18
- Minimum Established Patient Price $21.07
- Maximum Established Patient Price $155.29
- Average Established Patient Copayment $27.79
- Minimum Established Patient Copayment $5.26
- Maximum Established Patient Copayment $38.82
* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.
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. Abner Louissaint is affiliated with the following medical facilities:
| Hospital Name | Address | Phone | Hospital Type | Overall Rating |
|---|---|---|---|---|
| COOLEY DICKINSON HOSPITAL INC,THE | 30 LOCUST STREET NORTHAMPTON, MA 01060 | (413) 582-2000 | Acute Care Hospitals | |
| MASSACHUSETTS GENERAL HOSPITAL | 55 FRUIT STREET BOSTON, MA 02114 | (617) 724-9725 | Acute Care Hospitals | |
| MASSACHUSETTS EYE AND EAR INFIRMARY - | 243 CHARLES STREET BOSTON, MA 02114 | (617) 523-7900 | Acute Care Hospitals | |
| BRIGHAM AND WOMEN'S HOSPITAL | 75 FRANCIS STREET BOSTON, MA 02115 | (617) 732-5500 | Acute Care Hospitals |
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NPI 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 1124154950, we treat the final digit (0) 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 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).
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.
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.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 60 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
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BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1124154950, enumerated as an "individual" on February 26, 2007.
The provider is located at MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET BOSTON, MA 02114 and the phone number is (617) 726-2967.
Pathology with taxonomy code 207ZP0102X and a focus in Anatomic Pathology & Clinical Pathology.
Abner Louissaint is affiliated with: COOLEY DICKINSON HOSPITAL INC,THE, MASSACHUSETTS GENERAL HOSPITAL, MASSACHUSETTS EYE AND EAR INFIRMARY - and BRIGHAM AND WOMEN'S HOSPITAL.