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SIMA K RAMRATNAM M.D.
NPI 1699004812
Pediatrics - Pediatric Allergy/Immunology in Madison, WI

Active since December 17, 2009PECOS Enrolled
1675 HIGHLAND AVE, MADISON, WI 53792(608) 263-6420 Get Directions Write a Review

NPPES record last updated: January 15, 2021. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Jan 15, 2021, Nov 16, 2018 (2 updates tracked since 2018).

About Sima K Ramratnam M.d. NPPES

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

SIMA K RAMRATNAM M.D. (NPI 1699004812) is an individual pediatric allergy/immunology provider in Madison, Wisconsin, licensed in Wisconsin (61199) and active in the NPI registry since December 2009. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1699004812
Entity TypeIndividualFemale
Primary Taxonomy2080P0201X
Provider Legal NameSIMA K RAMRATNAMCredential: M.D.
Location Address1675 HIGHLAND AVEMadison, WI 53792-0001
Mailing Address7974 Uw Health CtMiddleton, WI 53562-5531
Phone(608) 263-6420
Sole ProprietorNo
Enumeration DateDecember 17, 2009
Last NPPES UpdateJanuary 15, 20212 updates tracked since enumeration
NPPES CertifiedJanuary 15, 2021
✔ NPI 1699004812 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric Allergy/ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0201X
License✔ Licensed in WI · 61199
Definition
A pediatrician who specializes in the diagnosis and treatment of allergies, allergic reactions, and immunologic diseases in children.
1675 HIGHLAND AVE, Madison, WI 53792
Open in Google Maps ↗

Other Names 1

Former Name (1)Sima Khakhkhar M.d.

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Aspirus Health Plan, Group Health Cooperative-SCW and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Sima K Ramratnam 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 Sima Ramratnam reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Of Wisconsin Medical Foundation, Inc
4.8 mi
Multi-Specialty
7974 UW HEALTH COURT
Middleton, WI 53562
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,832 clinicians in this Medicare group
NPI 1598784555 (608) 829-5485

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

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.

ERIN VAN SAMBEEK ERNST RN IBCLC
Registered Nurse (Lactation Consultant)
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 890-8227
CAROLINE NAKAMURA SLP
Speech-Language Pathologist
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 915-0650
CASSIDY LYNN BENDER RN
Registered Nurse
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-7337
DR. ANNE M MARSH M.D.
Pediatrics (Pediatric Hematology-Oncology)
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-9540
TALAL AL HENDAWI MD
Student in an Organized Health Care Education/Training Program
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 890-7221
AMANDA MARIE FABRY OTR, OTD
Occupational Therapist
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 890-5437
EMILY ANN ELDER PHARMD, MPH
Pharmacist (Pediatrics)
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-7337
TODD ROBERT SHELDON M.A.
Audiologist
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (082) 623-1476

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 Sima Ramratnam's NPI number?

The NPI number for Sima Ramratnam is 1699004812. It was assigned to this individual provider in the NPPES registry on December 17, 2009. The provider is also known as Sima Khakhkhar M.D..

Where is Sima Ramratnam located?

Sima Ramratnam practices at 1675 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-6420.

What is Sima Ramratnam's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Allergy/Immunology, with taxonomy code 2080P0201X.

Is Sima Ramratnam enrolled in Medicare?

Yes. Sima Ramratnam is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Sima Ramratnam's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sima Ramratnam reassigns Medicare benefits to University Of Wisconsin Medical Foundation, Inc (Middleton, WI). 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 Sima Ramratnam's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Sima Ramratnam accept?

Health plans from Anthem Blue Cross and Blue Shield, Aspirus Health Plan, Group Health Cooperative-SCW, HealthPartners and Quartz list Sima Ramratnam 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 Sima Ramratnam was last updated on January 15, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.