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ASHISH MAHAJAN M.D.
NPI 1497974539
Internal Medicine - Nephrology in Boston, MA

Active since April 25, 2007PECOS EnrolledAccepts Medicare Assignment
17.62/100
CMS Quality Rating
TUFTS NEW ENGLAND MEDICAL CENTER, 750 WASHINGTON ST. #391, BOSTON, MA 02111(617) 636-9606 Get Directions Write a Review

NPPES record last updated: August 18, 2010. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Ashish Mahajan M.d. NPPES

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

ASHISH MAHAJAN M.D. (NPI 1497974539) is an individual nephrology provider in Boston, Massachusetts, licensed in Massachusetts (222613) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS, is affiliated with Lowell General Hospital, and is a graduate of Other (2000).

NPPES Registry Identity

NPI1497974539
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameASHISH MAHAJANCredential: M.D.
Location AddressTUFTS NEW ENGLAND MEDICAL CENTER, 750 WASHINGTON ST. #391Boston, MA 02111
Mailing Address28 Mount Vernon St, Unit #1Somerville, MA 02145-3344 · (617) 636-9606
Phone(617) 636-9606
Sole ProprietorNo
Medical School CMSOtherGraduated 2000
Enumeration DateApril 25, 2007
Last NPPES UpdateAugust 18, 2010
✔ NPI 1497974539 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in MA · 222613
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
TUFTS NEW ENGLAND MEDICAL CENTER, Boston, MA 02111
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Taro Health.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Ashish Mahajan M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8224121850
PECOS Enrollment IDI20070912000421
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 Ashish Mahajan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Nephrology Asssociates Of The Merrimack Valley PC
22 mi
Nephrology
600 CLARK RD
Tewksbury, MA 01876
  • Reassigned Medicare billing, Massachusetts enrollment
  • 4 clinicians in this Medicare group
NPI 1700083433 (978) 453-1811

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 14

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
548 services173 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.
224 services141 patients
Dialysis services, 4 or more physician visits per month (20 years or older) 90960
Dialysis is a treatment that filters and purifies your blood using a machine. It helps keep your fluids and electrolytes in balance when the kidneys can't do their job. This service includes 4 or more visits per month with a physician to monitor your health and adjust your treatment as needed.
159 services74 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
101 services93 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.
88 services73 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
57 services38 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Lowell General Hospital

Acute Care Hospitals · Lowell, MA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220063
Location295 Varnum AvenueLowell, MA 01854 · Middlesex County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02111 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$144.11 typical visit price
range $63.72 – $189.86
Typical copayment $36.02 (range $15.93 – $47.46)
Most-billed visit code 99204
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

17.62/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Individually scored
Quality0
Improvement Activities0
Cost58.74

Referred Medical Equipment & Supplies CMS DME claims 5

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Tacrolimus, immediate release, oral, 1 mg J7507
Treatment-Treatment - Miscellaneous · category RX029N
2 suppliers22 claims3,260 services$0.31 avg. paid by Medicare
Prednisone, immediate release or delayed release, oral, 1 mg J7512
Treatment-Treatment - Miscellaneous · category RX029N
1 supplier13 claims2,925 services$0.01 avg. paid by Medicare
Mycophenolate mofetil, oral, 250 mg J7517
Treatment-Treatment - Miscellaneous · category RX029N
2 suppliers20 claims3,330 services$0.18 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period Q0511
Treatment-Chemotherapy · category RH012N
2 suppliers23 claims23 services$18.13 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for a subsequent prescription in a 30-day period Q0512
Treatment-Chemotherapy · category RH012N
2 suppliers27 claims35 services$11.92 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 4

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

ROBERT M BLANTON M.D.
Internal Medicine (Cardiovascular Disease)
TUFTS NEW ENGLAND MEDICAL CENTER, 800 WASHINGTON STREET
BOSTON, MA 02111
Suffolk County (617) 636-8236
LISA M BANTA M.D.
Anesthesiology
TUFTS NEW ENGLAND MEDICAL CENTER, 750 WASHINGTON STREET, BOX 298
BOSTON, MA 02111
Suffolk County (617) 636-6044
CHARLES F MOORE M.D.
Psychiatry & Neurology (Child & Adolescent Psychiatry)
TUFTS NEW ENGLAND MEDICAL CENTER, 750 WASHINGTON STREET
BOSTON, MA 02111
Suffolk County (617) 636-8440
ANDREW S LEVEY M.D.
Internal Medicine (Nephrology)
TUFTS NEW ENGLAND MEDICAL CENTER, 750 WASHINGTON ST., BOX 391
BOSTON, MA 02111
Suffolk County (617) 636-0563

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 Ashish Mahajan's NPI number?

The NPI number for Ashish Mahajan is 1497974539. It was assigned to this individual provider in the NPPES registry on April 25, 2007.

Where is Ashish Mahajan located?

Ashish Mahajan practices at Tufts New England Medical Center 750 Washington St. #391, Boston, MA 02111. The listed phone number is (617) 636-9606.

What is Ashish Mahajan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Ashish Mahajan enrolled in Medicare?

Yes. Ashish Mahajan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Ashish Mahajan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ashish Mahajan reassigns Medicare benefits to Nephrology Asssociates Of The Merrimack Valley PC (Tewksbury, 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 Ashish Mahajan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ashish Mahajan accept?

Health plans from Anthem Blue Cross and Blue Shield and Taro Health list Ashish Mahajan 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.

Is Ashish Mahajan affiliated with any hospitals?

According to CMS data, Ashish Mahajan is affiliated with Lowell General Hospital.

When was this NPI record last updated?

The NPPES record for Ashish Mahajan was last updated on August 18, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.