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MELANIE KAY SION M.D.
NPI 1669790622
Surgery - Surgical Critical Care in New Haven, CT

Active since May 13, 2010PECOS EnrolledAccepts Medicare Assignment
73.56/100
CMS Quality Rating
330 CEDAR ST # BB310, NEW HAVEN, CT 06510(203) 785-2572(203) 785-3950 Get Directions Write a Review

NPPES record last updated: August 16, 2018. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Aug 16, 2018, Aug 6, 2018 (2 updates tracked since 2018).

About Melanie Kay Sion M.d. NPPES

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

MELANIE KAY SION M.D. (NPI 1669790622) is an individual surgical critical care provider in New Haven, Connecticut, licensed in Connecticut (61143) and active in the NPI registry since May 2010. She is enrolled in Medicare PECOS and is a graduate of Georgetown University School Of Medicine (2010).

NPPES Registry Identity

NPI1669790622
Entity TypeIndividualFemale
Primary Taxonomy2086S0102X
Provider Legal NameMELANIE KAY SIONCredential: M.D.
Location Address330 CEDAR ST # BB310New Haven, CT 06510
Mailing AddressPo Box 208062New Haven, CT 06520-8062 · (203) 785-2572 · Fax (203) 785-3950
Phone(203) 785-2572
Fax(203) 785-3950
Sole ProprietorYes
Medical School CMSGeorgetown University School Of MedicineGraduated 2010
Enumeration DateMay 13, 2010
Last NPPES UpdateAugust 16, 20182 updates tracked since enumeration
✔ NPI 1669790622 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySurgery · Surgical Critical CareAllopathic & Osteopathic Physicians
Taxonomy Code2086S0102X
License✔ Licensed in CT · 61143
Definition
A surgeon with expertise in the management of the critically ill and postoperative patient, particularly the trauma victim, who specializes in critical care medicine diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.
330 CEDAR ST # BB310, New Haven, CT 06510
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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.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

Melanie Kay Sion 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 ID3072745421
PECOS Enrollment IDI20180801000411
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 Melanie Sion reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Yale University
0.3 mi
Advanced Practice Midwife
100 CHURCH ST S STE 200, YALE SCHOOL OF NURSING
New Haven, CT 06519
  • Reassigned Medicare billing, Connecticut enrollment
  • 3,728 clinicians in this Medicare group
NPI 1124148887 (203) 737-5432

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 4

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.
53 services22 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.
47 services32 patients
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes 99221
Initial hospital inpatient care refers to the first day of your stay in the hospital. This service typically includes a 30-minute check-up with a healthcare professional. They'll assess your health, discuss your condition, and plan your treatment. It's part of ensuring you receive the best possible care.
20 services20 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.
20 services20 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

73.56/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality75.84
Promoting Interoperability74
Improvement Activities40
Cost51.43

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.

DR. ADRIAN ANTHONY MAUNG MD
Surgery
330 CEDAR ST # BB310, YALE UNIVERSITY SCHOOL OF MEDICINE SECTION OF TRAUMA
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 785-3494
GRETA L PIPER M.D.
Surgery (Trauma Surgery)
330 CEDAR ST # BB310
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 785-2572
DR. DANIEL E KIM M.D.
Surgery
330 CEDAR ST # BB310
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 785-2572

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 Melanie Sion's NPI number?

The NPI number for Melanie Sion is 1669790622. It was assigned to this individual provider in the NPPES registry on May 13, 2010.

Where is Melanie Sion located?

Melanie Sion practices at 330 Cedar St # Bb310, New Haven, CT 06510. The listed phone number is (203) 785-2572.

What is Melanie Sion's specialty?

The primary specialty registered for this NPI is Surgery, specializing in Surgical Critical Care, with taxonomy code 2086S0102X.

Is Melanie Sion enrolled in Medicare?

Yes. Melanie Sion 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 Melanie Sion's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Melanie Sion reassigns Medicare benefits to Yale University (New Haven, CT). 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 Melanie Sion's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Melanie Sion accept?

Health plans from Anthem Blue Cross and Blue Shield list Melanie Sion 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.

When was this NPI record last updated?

The NPPES record for Melanie Sion was last updated on August 16, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.