Antonia Jill Sigl, M.D.
Pediatrics Physician · Johnstown, CO
Antonia Jill Sigl, M.D. is a pediatrics physician with a practice address in Johnstown, Colorado, and NPI 1043665730, issued on Apr 29, 2016. Check the license (Colorado DR.0062379, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Antonia Jill Sigl
- Credential
- M.D.
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- DR.0062379 CO
Self-reported in NPPES; status is on the state search - Practice location
- 4435 Ronald Reagan Blvd, Johnstown, CO 80534
- Phone
- (970) 619-8139
- Enumerated
- Apr 29, 2016
- Record last updated
- Dec 6, 2019 (not updated in 7 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 1,155 in Colorado → Look up another NPI →
Also registered at 4435 Ronald Reagan Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Madelyn Black, MOT, OTR/LOccupational Therapist1356079065
- Carolyn Coates, OTR/LOccupational Therapist1639835283
- Ashlea Franques, M.D.Pediatrics Physician1699896613
- Emma GossFamily Nurse Practitioner1720937402
- Netanya Huska, MOTOccupational Therapist1447099577
- Molly Lalonde, CPNPPediatric Nurse Practitioner1740670140
Verify Antonia Jill Sigl in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0062379Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $34.98
2 payments; by number, the most common kind was food and beverage; the largest payer was Merck Sharp & Dohme LLC. The 21,580 providers of this specialty with any payment received $842.05 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Antonia Jill Sigl among 1,155 pediatrics physician records in Colorado
Antonia Jill Sigl, M.D. is one of 1,155 pediatrics physician records with a practice address in Colorado. 27% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 84% of them.
- NPI issued2016 · 84% of these records are older, 14% newer
- In a Medicare fileYes · 27% of these records are
- In the CMS Doctors and Clinicians fileNo · 6% of these records are
- Record last updated2019 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
4 pediatrics physician records list a practice address in Johnstown
They are 4 of the 163 NPPES records with a practice address in Johnstown, and 1,155 pediatrics physician records in Colorado.
All 1,155 in Colorado → Every provider in Johnstown → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Ashlea Franques, M.D.Johnstown, CO 805341699896613
- Michelle Ward, M.DJohnstown, CO 805341154563302
- Laurel Wood, MDJohnstown, CO 805341710507413
- Robert Bruce, MDLoveland, CO 805371922098292
- Bradley Ethington, DOLoveland, CO 805371205196391
- McKay Marler, MDLoveland, CO 805371629163183
- Jennifer Norman, MDLoveland, CO 805371245213404
- Jenny Patrick, MDLoveland, CO 805371447233614
Common questions
What is Antonia Jill Sigl, M.D.'s NPI number?
Antonia Jill Sigl, M.D.'s National Provider Identifier (NPI) is 1043665730, issued on Apr 29, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Antonia Jill Sigl, M.D. located?
The NPPES record lists a practice address at 4435 Ronald Reagan Blvd, Johnstown, CO, 80534. Phone: (970) 619-8139. Providers update this record themselves, so call before visiting.
How can I verify Antonia Jill Sigl, M.D.'s license?
NPPES lists Colorado license number DR.0062379, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.