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DR. GARY ALAN BASS MD
NPI 1881924801
Surgery in Philadelphia, PA

Active since January 14, 2010PECOS EnrolledAccepts Medicare Assignment
3400 SPRUCE STREET, PHILADELPHIA, PA 19104(215) 349-8310(215) 893-7270 Get Directions Write a Review

NPPES record last updated: May 21, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 21, 2026, Dec 17, 2025, Apr 4, 2021 and 1 more (4 updates tracked since 2020).

About Dr. Gary Alan Bass Md NPPES

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

DR. GARY ALAN BASS MD (NPI 1881924801) is an individual surgery provider in Philadelphia, Pennsylvania, licensed in Pennsylvania (MD472249) and active in the NPI registry since January 2010. He is enrolled in Medicare PECOS, is affiliated with Hospital Of Univ Of Pennsylvania, and maintains a secondary practice location in Philadelphia.

NPPES Registry Identity

NPI1881924801
Entity TypeIndividualMale
Primary Taxonomy208600000X
Provider Legal NameDR. GARY ALAN BASSCredential: MD
Location Address3400 SPRUCE STREETPhiladelphia, PA 19104-3309
Mailing Address3400 Spruce StreetPhiladelphia, PA 19104-3309 · (215) 349-8310 · Fax (215) 893-7270
Phone(215) 349-8310
Fax(215) 893-7270
Sole ProprietorNo
Medical School CMSOtherGraduated 2006
Enumeration DateJanuary 14, 2010
Last NPPES UpdateMay 21, 20264 updates tracked since enumeration
NPPES CertifiedMay 21, 2026
✔ NPI 1881924801 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtySurgeryAllopathic & Osteopathic Physicians
Taxonomy Code208600000X
License✔ Licensed in PA · MD472249
Definition
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Also ListedSurgery · Surgical Critical CareTaxonomy 2086S0102X · License MD472249 (PA)
3400 SPRUCE STREET, Philadelphia, PA 19104
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Secondary Practice Location 1

Location 151 North 39th Street, Medical Office Building Suite 120 (Trauma)Philadelphia, PA 19104 · Phone (216) 316-5151

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter Health, Ambetter Health of Delaware.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

Dr. Gary Alan Bass Md 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 ID5395147623
PECOS Enrollment IDI20210709000483
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 Gary Bass reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Of Penn - Medical Group
Same address
Hospitalist
3400 SPRUCE ST
Philadelphia, PA 19104
  • Reassigned Medicare billing, Pennsylvania enrollment
  • Also billed through NPI 1073902169 (Pennsylvania)
  • 752 clinicians in this Medicare group
NPI 1053447151 (215) 662-4000

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.

Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
74 services42 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.
48 services31 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.
41 services29 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.
20 services20 patients
Ultrasound scan of chest 76604
An ultrasound scan of the chest is a non-invasive imaging procedure that uses sound waves to create pictures of the structures within your chest, such as your heart and lungs. It's a safe, painless method that helps doctors diagnose and monitor various conditions.
15 services15 patients
Limited ultrasound scan of abdomen 76705
A limited ultrasound scan of the abdomen is a non-invasive imaging test. It uses sound waves to produce images of the abdominal organs such as the liver, gallbladder, spleen, pancreas, and kidneys. This helps to identify any abnormalities or issues.
15 services15 patients

Hospital Affiliations CMS Care Compare 3

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

Hospital Of Univ Of Pennsylvania

Acute Care Hospitals · Philadelphia, PA
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number390111
Location34th & Spruce StsPhiladelphia, PA 19104 · Philadelphia County
Emergency services Birthing friendly

Penn Presbyterian Medical Center

Acute Care Hospitals · Philadelphia, PA
5/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number390223
Location51 North 39th StreetPhiladelphia, PA 19104 · Philadelphia County
Emergency services

Pennsylvania Hospital

Acute Care Hospitals · Philadelphia, PA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number390226
Location800 Spruce StreetPhiladelphia, PA 19107 · Philadelphia County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 19104 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
$92.69 typical visit price
range $59.88 – $180.99
Typical copayment $23.17 (range $14.97 – $45.24)
Most-billed visit code 99203
Established Patient
$74.47 typical visit price
range $19.30 – $147.29
Typical copayment $18.61 (range $4.82 – $36.82)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

SARAH KUMAR M.D.
Anesthesiology (Critical Care Medicine)
3400 SPRUCE STREET
PHILADELPHIA, PA 19104
Philadelphia County (215) 349-8310
RYAN MCCLINTOCK MD
Radiology (Diagnostic Radiology)
3400 SPRUCE STREET
PHILADELPHIA, PA 19104
Philadelphia County (215) 662-3000
ADRIAN W ONG MD
Surgery (Surgical Critical Care)
3400 SPRUCE STREET, 2 DULLES
PHILADELPHIA, PA 19104
Philadelphia County (215) 662-7320
MATHEW N BESHARA MD
Obstetrics & Gynecology
3400 SPRUCE STREET, 5 PENN TOWER
PHILADELPHIA, PA 19104
Philadelphia County (215) 662-6035
JILL E LANGER MD
Radiology (Diagnostic Radiology)
3400 SPRUCE STREET, GROUND FLOOR DULLES
PHILADELPHIA, PA 19104
Philadelphia County (215) 662-7012
BERNADETTE C WHEELER MD
Obstetrics & Gynecology
3400 SPRUCE STREET, 1 WEST GATES
PHILADELPHIA, PA 19104
Philadelphia County (215) 662-2730
EDWARD T DICKINSON MD
Emergency Medicine
3400 SPRUCE STREET, GROUND SILVERSTEIN BLDG
PHILADELPHIA, PA 19104
Philadelphia County (215) 662-6698
WENDY RACHEL GALPERN MD, PHD
Psychiatry & Neurology (Neurology)
3400 SPRUCE STREET
PHILADELPHIA, PA 19104
Philadelphia County (215) 662-2219

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 Gary Bass's NPI number?

The NPI number for Gary Bass is 1881924801. It was assigned to this individual provider in the NPPES registry on January 14, 2010.

Where is Gary Bass located?

Gary Bass practices at 3400 Spruce Street, Philadelphia, PA 19104. The listed phone number is (215) 349-8310.

What is Gary Bass's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

Is Gary Bass enrolled in Medicare?

Yes. Gary Bass 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 Gary Bass's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gary Bass reassigns Medicare benefits to University Of Penn - Medical Group (Philadelphia, PA). 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 Gary Bass's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gary Bass accept?

Health plans from Ambetter Health, Ambetter Health of Delaware and Ambetter from Buckeye Health Plan list Gary Bass 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 Gary Bass affiliated with any hospitals?

According to CMS data, Gary Bass is affiliated with Hospital Of Univ Of Pennsylvania, Penn Presbyterian Medical Center and Pennsylvania Hospital.

When was this NPI record last updated?

The NPPES record for Gary Bass was last updated on May 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months 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.