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DR. MELISSA SIEDSCHLAG M.D.
NPI 1093976516
Internal Medicine in Washington, DC

Active since June 18, 2008PECOS Enrolled
111 MICHIGAN AVE NW, WASHINGTON, DC 20010(202) 476-6151 Get Directions Write a Review

NPPES record last updated: September 22, 2022. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Sep 22, 2022, Jul 4, 2018 (2 updates tracked since 2018).

About Dr. Melissa Siedschlag M.d. NPPES

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

DR. MELISSA SIEDSCHLAG M.D. (NPI 1093976516) is an individual internal medicine provider in Washington, District Of Columbia, licensed in Maryland (D0095556) and active in the NPI registry since June 2008. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1093976516
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. MELISSA SIEDSCHLAGCredential: M.D.
Location Address111 MICHIGAN AVE NWWashington, DC 20010
Mailing Address11440 Commerce Park Dr Ste 602Reston, VA 20191-1555 · (571) 375-8366
Phone(202) 476-6151
Sole ProprietorYes
Enumeration DateJune 18, 2008
Last NPPES UpdateSeptember 22, 20222 updates tracked since enumeration
NPPES CertifiedSeptember 22, 2022
✔ NPI 1093976516 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in MD · D0095556✔ Licensed in AZ · 45989
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 ListedPediatricsTaxonomy 208000000X · License MD041306 (DC)
Also ListedPediatrics · Pediatric Infectious DiseasesTaxonomy 2080P0208X · License MD041306 (DC)
111 MICHIGAN AVE NW, Washington, DC 20010
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Other Names 1

Former Name (1)Dr. Melissa Del Castillo M.d.

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Melissa Siedschlag M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Melissa Siedschlag reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Children's Hospital
Same address
Pediatrics
111 MICHIGAN AVE NW
Washington, DC 20010
  • Reassigned Medicare billing, District of Columbia enrollment
  • 1,417 clinicians in this Medicare group
NPI 1780800128 (202) 476-5000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20010 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
$147.85 typical visit price
range $65.18 – $194.86
Typical copayment $36.96 (range $16.29 – $48.71)
Most-billed visit code 99204
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
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.

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.

DR. ANDREA BADILLO MD
Surgery
111 MICHIGAN AVE NW
WASHINGTON, DC 20010
District of Columbia (202) 476-2451
DR. TALITA MICHELLE JORDAN MD
Pediatrics
111 MICHIGAN AVE NW
WASHINGTON, DC 20010
District of Columbia (202) 476-5000
YUE-HIN LOKE MD
Pediatrics (Pediatric Cardiology)
111 MICHIGAN AVE NW, W3.5, 600
WASHINGTON, DC 20010
District of Columbia (202) 476-3670
ELSHADEY YAYEHYERADE BEKELE
Pediatrics
111 MICHIGAN AVE NW
WASHINGTON, DC 20010
District of Columbia (301) 565-4279
NOURA AL DHAHERI MD
Student in an Organized Health Care Education/Training Program
111 MICHIGAN AVE NW, W3.5, 600
WASHINGTON, DC 20010
District of Columbia (202) 476-3670
JIA LIU MD
Anesthesiology (Pediatric Anesthesiology)
111 MICHIGAN AVE NW
WASHINGTON, DC 20010
District of Columbia (202) 476-5000
DR. CHARLES JOHN BILLINGTON JR. MD
Medical Genetics (Clinical Genetics (M.D.))
111 MICHIGAN AVE NW, W3.5, 600
WASHINGTON, DC 20010
District of Columbia (202) 476-3670
GINA JIN LEE PHARMD
Pharmacist (Pharmacotherapy)
111 MICHIGAN AVE NW
WASHINGTON, DC 20010
District of Columbia (202) 476-4080

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 Melissa Siedschlag's NPI number?

The NPI number for Melissa Siedschlag is 1093976516. It was assigned to this individual provider in the NPPES registry on June 18, 2008. The provider is also known as Dr. Melissa Del Castillo M.D..

Where is Melissa Siedschlag located?

Melissa Siedschlag practices at 111 Michigan Ave NW, Washington, DC 20010. The listed phone number is (202) 476-6151.

What is Melissa Siedschlag's specialty?

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

Is Melissa Siedschlag enrolled in Medicare?

Yes. Melissa Siedschlag is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Melissa Siedschlag's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Melissa Siedschlag reassigns Medicare benefits to Children's Hospital (Washington, DC). 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 Melissa Siedschlag's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Melissa Siedschlag was last updated on September 22, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.