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DR. STEVEN I MASTER M.D.
NPI 1255564837
Internal Medicine in Cambridge, MA

Active since August 28, 2009PECOS EnrolledAccepts Medicare Assignment
330 MOUNT AUBURN ST, CAMBRIDGE, MA 02138(617) 499-5112 Get Directions Write a Review

NPPES record last updated: September 3, 2014. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Steven I Master M.d. NPPES

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

DR. STEVEN I MASTER M.D. (NPI 1255564837) is an individual internal medicine provider in Cambridge, Massachusetts, licensed in Massachusetts (248246) and active in the NPI registry since August 2009. He is enrolled in Medicare PECOS, is affiliated with Mount Auburn Hospital, and is a graduate of New York Medical College (2008).

NPPES Registry Identity

NPI1255564837
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. STEVEN I MASTERCredential: M.D.
Location Address330 MOUNT AUBURN STCambridge, MA 02138-5502
Mailing Address330 Mount Auburn StCambridge, MA 02138-5502 · (617) 499-5112
Phone(617) 499-5112
Sole ProprietorYes
Medical School CMSNew York Medical CollegeGraduated 2008
Enumeration DateAugust 28, 2009
Last NPPES UpdateSeptember 3, 2014
✔ NPI 1255564837 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MA · 248246
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
330 MOUNT AUBURN ST, Cambridge, MA 02138
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Steven I Master 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 ID5496929549
PECOS Enrollment IDI20111129000706
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.

Areas of Expertise CMS Part B claims 7

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 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.
324 services179 patients
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.
313 services167 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
138 services136 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
72 services11 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
48 services48 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
44 services44 patients

Hospital Affiliations CMS Care Compare

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

Mount Auburn Hospital

Acute Care Hospitals · Cambridge, MA
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220002
Location330 Mount Auburn StreetCambridge, MA 02138 · Middlesex County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02138 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.

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.

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
1 supplier11 claims11 services$67.93 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 20

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

MR. MIGUEL ANGEL PAZ PA-C
Physician Assistant (Surgical)
330 MOUNT AUBURN ST
CAMBRIDGE, MA 02138
Middlesex County (617) 499-3500
DR. ALAAELDIN AHMED MD
Student in an Organized Health Care Education/Training Program
330 MOUNT AUBURN ST
CAMBRIDGE, MA 02138
Middlesex County (617) 492-3500
DR. JANE R. SHARP MD
Obstetrics & Gynecology
330 MOUNT AUBURN ST
CAMBRIDGE, MA 02138
Middlesex County (617) 499-5151
DR. LAURA NEED MD
Pediatrics (Pediatric Cardiology)
330 MOUNT AUBURN ST, NEWBORN SERVICES
CAMBRIDGE, MA 02138
Middlesex County (617) 499-5595
DR. VALERIE PRONIO-STELLUTO MD
Internal Medicine
330 MOUNT AUBURN ST
CAMBRIDGE, MA 02138
Middlesex County (617) 499-5140
DR. BENJAMIN KERMAN MD
Emergency Medicine
330 MOUNT AUBURN ST
CAMBRIDGE, MA 02138
Middlesex County (617) 499-5025
ANAESTHESIA ASSOCIATES OF MASSACHUSETTS, PC
Anesthesiology
330 MOUNT AUBURN ST
CAMBRIDGE, MA 02138
Middlesex County (617) 499-5075
PAVLINA CHRYSAFI
Student in an Organized Health Care Education/Training Program
330 MOUNT AUBURN ST
CAMBRIDGE, MA 02138
Middlesex County (617) 492-3500

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 Steven Master's NPI number?

The NPI number for Steven Master is 1255564837. It was assigned to this individual provider in the NPPES registry on August 28, 2009.

Where is Steven Master located?

Steven Master practices at 330 Mount Auburn St, Cambridge, MA 02138. The listed phone number is (617) 499-5112.

What is Steven Master's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Steven Master enrolled in Medicare?

Yes. Steven Master 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.

Is Steven Master affiliated with any hospitals?

According to CMS data, Steven Master is affiliated with Mount Auburn Hospital.

When was this NPI record last updated?

The NPPES record for Steven Master was last updated on September 3, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.