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KAREN J CHANG-CHEN MD
NPI 1508916495
Internal Medicine - Endocrinology, Diabetes & Metabolism in Chesterfield, MO

Active since January 11, 2007PECOS EnrolledAccepts Medicare Assignment
224 S WOODS MILL RD STE 480S, CHESTERFIELD, MO 63017(636) 685-7744 Get Directions Write a Review

NPPES record last updated: July 28, 2020. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 28, 2020, Oct 5, 2019, Feb 17, 2016 (3 updates tracked since 2016).

About Karen J Chang-chen Md NPPES

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

KAREN J CHANG-CHEN MD (NPI 1508916495) is an individual endocrinology, diabetes & metabolism provider in Chesterfield, Missouri, licensed in Missouri (2006018028) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS, is affiliated with St Lukes Hospital, and is a graduate of Other (2003).

NPPES Registry Identity

NPI1508916495
Entity TypeIndividualFemale
Primary Taxonomy207RE0101X
Provider Legal NameKAREN J CHANG-CHENCredential: MD
Location Address224 S WOODS MILL RD STE 480SChesterfield, MO 63017
Mailing Address224 S Woods Mill Rd Ste 480sChesterfield, MO 63017-3609 · (636) 685-7744
Phone(636) 685-7744
Sole ProprietorNo
Medical School CMSOtherGraduated 2003
Enumeration DateJanuary 11, 2007
Last NPPES UpdateJuly 28, 20203 updates tracked since enumeration
NPPES CertifiedJuly 28, 2020
✔ NPI 1508916495 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in MO · 2006018028
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
Also ListedInternal MedicineTaxonomy 207R00000X · License 2006018028 (MO)
224 S WOODS MILL RD STE 480S, Chesterfield, MO 63017
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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, Oscar Insurance Company, UnitedHealthcare.Insurance ›

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

Karen J Chang-chen 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 ID3577617687
PECOS Enrollment IDI20170116000208
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 10

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.

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.
302 services175 patients
Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report 95251
This procedure involves placing a small sensor under your skin to continuously monitor your blood sugar levels in tissue fluid. The data is interpreted and a report is generated to help manage your diabetes more effectively.
130 services59 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.
56 services50 patients
Telephone medical discussion with physician, 5-10 minutes 99441
A telephone medical discussion with a physician is a brief, 5-10 minute call where you can discuss your health concerns. It's a convenient way to receive medical advice without needing to visit a clinic. It's important to prepare questions in advance to make the most of this time.
39 services24 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.
37 services26 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
35 services35 patients

Hospital Affiliations CMS Care Compare

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

St Lukes Hospital

Acute Care Hospitals · Chesterfield, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260179
Location232 S Woods Mill RdChesterfield, MO 63017 · St. Louis County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63017 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
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
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 6

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

Supplies for maintenance of insulin infusion catheter, per week A4224
DME-Other DME · category DE017N
3 suppliers12 claims146 services$17.02 avg. paid by Medicare
Supplies for external insulin infusion pump, syringe type cartridge, sterile, each A4225
DME-Other DME · category DE017N
3 suppliers12 claims420 services$2.37 avg. paid by Medicare
Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
38 suppliers101 claims339 services$6.20 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
14 suppliers30 claims62 services$1.12 avg. paid by Medicare
Insulin for administration through dme (i.e., insulin pump) per 50 units J1817
Treatment-Injections and Infusions (nononcologic) · category RI000N
4 suppliers13 claims1,420 services$6.10 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
15 suppliers290 claims293 services$191.47 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 3

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

ENDOCRINE ASSOCIATES, LLC
Internal Medicine (Endocrinology, Diabetes & Metabolism)
224 S WOODS MILL RD STE 480S
CHESTERFIELD, MO 63017
St. Louis County (636) 685-7744
SOUMYA M NADELLA M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
224 S WOODS MILL RD STE 480S
CHESTERFIELD, MO 63017
St. Louis County (366) 857-7446
VAISHALIBEN AHIR MD
Internal Medicine (Endocrinology, Diabetes & Metabolism)
224 S WOODS MILL RD STE 480S
CHESTERFIELD, MO 63017
St. Louis County (636) 685-7744

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 Karen Chang-chen's NPI number?

The NPI number for Karen Chang-chen is 1508916495. It was assigned to this individual provider in the NPPES registry on January 11, 2007.

Where is Karen Chang-chen located?

Karen Chang-chen practices at 224 S Woods Mill Rd Ste 480S, Chesterfield, MO 63017. The listed phone number is (636) 685-7744.

What is Karen Chang-chen's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Karen Chang-chen enrolled in Medicare?

Yes. Karen Chang-chen 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.

What insurance does Karen Chang-chen accept?

Health plans from Anthem Blue Cross and Blue Shield, Oscar Insurance Company and UnitedHealthcare list Karen Chang-chen 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 Karen Chang-chen affiliated with any hospitals?

According to CMS data, Karen Chang-chen is affiliated with St Lukes Hospital.

When was this NPI record last updated?

The NPPES record for Karen Chang-chen was last updated on July 28, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.