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KRISTEN SINGER M.D.
NPI 1457615692
Internal Medicine - Gastroenterology in Philadelphia, PA

Active since July 03, 2012PECOS EnrolledAccepts Medicare Assignment
1300 WOLF ST FL 1, PHILADELPHIA, PA 19148(215) 955-8900(215) 923-3447 Get Directions Write a Review

NPPES record last updated: January 30, 2019. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 30, 2019, Nov 9, 2018, Jan 28, 2016 (3 updates tracked since 2016).

About Kristen Singer M.d. NPPES

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

KRISTEN SINGER M.D. (NPI 1457615692) is an individual gastroenterology provider in Philadelphia, Pennsylvania, licensed in Pennsylvania (MD466066) and active in the NPI registry since July 2012. She is enrolled in Medicare PECOS, is affiliated with Thomas Jefferson University Hospital, and maintains a secondary practice location in Boston.

NPPES Registry Identity

NPI1457615692
Entity TypeIndividualFemale
Primary Taxonomy207RG0100X
Provider Legal NameKRISTEN SINGERCredential: M.D.
Location Address1300 WOLF ST FL 1Philadelphia, PA 19148-2912
Mailing Address132 South 10th Street, 480 Main BuildingPhiladelphia, PA 19107-5244 · (215) 955-8900 · Fax (215) 955-5245
Phone(215) 955-8900
Fax(215) 923-3447
Sole ProprietorNo
Medical School CMSUniversity Of Maryland School Of MedicineGraduated 2012
Enumeration DateJuly 3, 2012
Last NPPES UpdateJanuary 30, 20193 updates tracked since enumeration
✔ NPI 1457615692 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
Licenses✔ Licensed in PA · MD466066✔ Licensed in MA · 263920
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Also ListedInternal MedicineTaxonomy 207R00000X · License 2012019699 (MO)
1300 WOLF ST FL 1, Philadelphia, PA 19148
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Other Names 1

Other Name (5)Kristen Singer Guaraldo M.d.

Secondary Practice Location 1

Location 1800 Washington St, Box 233Boston, MA 02111-1552 · Phone (617) 636-5883

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

Kristen Singer 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 ID7315176690
PECOS Enrollment IDI20181205001945
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 Kristen Singer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Jefferson University Physicians
2.1 mi
General Practice
33 S. 9TH STREET
Philadelphia, PA 19107
  • Reassigned Medicare billing, Pennsylvania enrollment
  • 1,739 clinicians in this Medicare group
NPI 1326093675 (215) 955-0000

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 9

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.
89 services38 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.
86 services52 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.
45 services37 patients
Biopsy of large bowel using a flexible endoscope 45380
A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.
36 services35 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.
34 services33 patients
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239
This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.
30 services28 patients

Hospital Affiliations CMS Care Compare

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

Thomas Jefferson University Hospital

Acute Care Hospitals · Philadelphia, PA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number390174
Location111 South 11th StreetPhiladelphia, PA 19107 · Philadelphia County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 19148 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
$137.17 typical visit price
range $59.88 – $180.99
Typical copayment $34.29 (range $14.97 – $45.24)
Most-billed visit code 99204
Established Patient
$105.21 typical visit price
range $19.30 – $147.29
Typical copayment $26.30 (range $4.82 – $36.82)
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.

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 Kristen Singer's NPI number?

The NPI number for Kristen Singer is 1457615692. It was assigned to this individual provider in the NPPES registry on July 3, 2012. The provider is also known as Kristen Singer Guaraldo M.D..

Where is Kristen Singer located?

Kristen Singer practices at 1300 Wolf St Fl 1, Philadelphia, PA 19148. The listed phone number is (215) 955-8900.

What is Kristen Singer's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Kristen Singer enrolled in Medicare?

Yes. Kristen Singer 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 Kristen Singer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Kristen Singer reassigns Medicare benefits to Jefferson University Physicians (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 Kristen Singer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Kristen Singer accept?

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

According to CMS data, Kristen Singer is affiliated with Thomas Jefferson University Hospital.

When was this NPI record last updated?

The NPPES record for Kristen Singer was last updated on January 30, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.