SONJA STILP

NPI 1659304343 · Physician · Anthem

Provider Status Assessment

Verified Active

Strong multi-source corroboration of active practice across 8 carrier networks with confirmed Colorado DORA license.

Confidence: High

Evidence: 5361 items from 14 sources

Signals: 6 supporting · 0 opposing

Resolution: All evidence sources corroborate active practice. 6 supporting signals with no contradictions across 8 evaluated sources.

Data Source Signals

✓

NPPES

BOULDER, 80304

Freshness: Unknown

✓

Network Status

Listed with 9 carriers

anthem_co — in_network (commercial)
anthem_co — in_network (commercial)
uhc — in_network (fhir:uhc)
uhc_services_co — in_network (commercial)
uhc_colorado_co — in_network (commercial)
uhc_insurance_co — in_network (commercial)
uhc_umr_co — in_network (commercial)
uhc_surest_co — in_network (commercial)
kaiser_co — in_network (commercial)

✓

DORA License

Active

✗

Medicare

Enrolled but no billing activity

✗

Care Compare

Address mismatch with NPPES

LEADVILLE, 80461

✓

PECOS Enrollment

Medicare enrolled

System Reasoning

Claim Under Evaluation

Provider is actively practicing and appropriately listed in carrier networks

Evidence Evaluated

Medicare Billing: Enrolled in Medicare but no recent billing data

FHIR Directory: No active FHIR endpoint despite carrier listings

NPPES Registry: Active NPI, registered in BOULDER

Colorado DORA License: License status: Active

PECOS Enrollment: Medicare enrollment confirmed

Federal Exclusion Check: No federal exclusions found (OIG LEIE, SAM.gov)

Carrier Networks: Listed in 9 carrier networks

CMS Care Compare: Found in Care Compare with 1 location

Trust Evaluation

identity:0.75Strong

licensure:0.90Strong

activity:

Dimension Scores

Composite0.86

Identity0.75 — Moderate

Active NPI with specialty classification

Licensure0.90 — Strong

Active Colorado DORA license confirmed

Activity1.00 — Strong

Active Medicare billing confirmed

Reachability0.60 — Moderate

Single address source (NPPES)

Network1.00 — Strong

Listed in multiple carrier networks

Why is this provider classified as “verified active”?

Strong multi-source corroboration of active practice. All dimensions above 0.55 with evidence depth ≥ 5. Active license confirmed.

Carrier Network Listings

8 networks across 4 carriers

Strong network presence across 8 carrier networks with corroborating federal activity signals.

Anthem(1 network)

1 DOI 6C-3

Anthem Blue Cross Blue ShieldDOI 6C-3

View carrier →

uhc(1 network)

1 Federal TiC

uhcFederal TiC

View carrier →

UnitedHealthcare(5 networks)

1 DOI 6C-34 Federal TiC

UnitedHealthcare ServicesFederal TiC

View carrier →

Related Investigations

All providers in Anthem Blue Cross Blue Shield networkView →All Physician providers statewideView →All providers in BOULDER 80304View →All providers classified as Verified ActiveView →

Known Addresses

NPPESBOULDER, 80304

Care CompareLEADVILLE, 80461

Evidence

5361 items across 22 assertions from 14 sources

Connected Records

Practice Address

LEADVILLE, 80461

cms_care_compare, NPPES

Carrier Network Listing

Listed in 8 carrier networks

TiC: Anthem Blue Cross Blue Shield, FHIR: uhc, TiC: UnitedHealthcare Services, TiC: UnitedHealthcare Insurance, TiC: UnitedHealthcare (UMR), TiC: UnitedHealthcare Colorado, TiC: UnitedHealthcare (Surest), TiC: Kaiser Permanente

Colorado License

Active

DORA

FHIR Directory Status

Found in directory

FHIR: uhc

NPI Registration

Status: active

NPPES Deactivation

Order/Referring Eligibility

Record found

cms_order_refer

Medicare Enrollment

Enrolled

PECOS

entity_type

Record found

NPPES

Federal Exclusion Check

No exclusion found

OIG LEIE + SAM.gov

Evidence Lineage

Carrier Network ListingTrust: 0.80

↓TiC: Anthem Blue Cross Blue Shield5296 records ·weight 0.80 · Latest: Mar 14, 2026

Carrier Network ListingTrust: 0.80

↓TiC: Anthem Blue Cross Blue Shield8 records ·weight 0.80 · Latest: Mar 14, 2026

Colorado License StatusTrust: 0.95

↓DORA5 records ·weight 0.98 · Latest: Mar 6, 2026

Matched via: license_number

Colorado License StatusTrust: 0.95

↓DORA3 records ·weight 0.60 · Latest: Mar 13, 2026

Matched via: primary

Colorado License StatusTrust: 0.95

Timeline

Mar 14, 2026Carrier listing: Anthem Blue Cross Blue Shield

Mar 13, 2026DORA license check: Active

Mar 13, 2026DORA license check: Expired

Mar 13, 2026Carrier listing: uhc

Mar 13, 2026FHIR directory lookup: found

Mar 12, 2026Carrier listing: UnitedHealthcare Services

Mar 12, 2026Carrier listing: UnitedHealthcare Insurance

Mar 12, 2026NPPES record: active

Mar 12, 2026Carrier listing: UnitedHealthcare (UMR)

Mar 12, 2026Carrier listing: UnitedHealthcare Colorado

Mar 11, 2026

Evidence

Loading evidence lineage...

Disclaimer: This analysis uses publicly available federal and state data sources. It does not constitute a determination of provider status or network participation. Contact the provider or health plan directly to verify current status.

Order/Referring eligible: Yes

reachability:0.60Moderate

System Determination

Verified Active

Composite score: 0.858

Strong multi-source corroboration of active practice across 8 carrier networks with confirmed Colorado DORA license.

UnitedHealthcare of ColoradoDOI 6C-3

View carrier →

UnitedHealthcare InsuranceFederal TiC

View carrier →

UnitedHealthcare UMRFederal TiC

View carrier →

UnitedHealthcare SurestFederal TiC

View carrier →

Kaiser Permanente(1 network)

1 DOI 6C-3

Kaiser PermanenteDOI 6C-3

View carrier →

Evidence

5361 items across 22 assertions from 14 sources

Connected Records

Practice Address

LEADVILLE, 80461

cms_care_compare, NPPES

Carrier Network Listing

Listed in 8 carrier networks

Colorado License

Active

DORA

FHIR Directory Status

Found in directory

FHIR: uhc

NPI Registration

Status: active

NPPES Deactivation

Order/Referring Eligibility

Record found

cms_order_refer

Medicare Enrollment

Enrolled

PECOS

entity_type

Record found

NPPES

Federal Exclusion Check

No exclusion found

OIG LEIE + SAM.gov

Evidence Lineage

Carrier Network ListingTrust: 0.80

↓TiC: Anthem Blue Cross Blue Shield5296 records ·weight 0.80 · Latest: Mar 14, 2026

Carrier Network ListingTrust: 0.80

↓TiC: Anthem Blue Cross Blue Shield8 records ·weight 0.80 · Latest: Mar 14, 2026

Colorado License StatusTrust: 0.95

↓DORA5 records ·weight 0.98 · Latest: Mar 6, 2026

Matched via: license_number

Colorado License StatusTrust: 0.95

↓DORA3 records ·weight 0.60 · Latest: Mar 13, 2026

Matched via: primary

Colorado License StatusTrust: 0.95

Timeline

Mar 14, 2026Carrier listing: Anthem Blue Cross Blue Shield

Mar 13, 2026DORA license check: Active

Mar 13, 2026DORA license check: Expired

Mar 13, 2026Carrier listing: uhc

Mar 13, 2026FHIR directory lookup: found

Mar 12, 2026Carrier listing: UnitedHealthcare Services

Mar 12, 2026Carrier listing: UnitedHealthcare Insurance

Mar 12, 2026NPPES record: active

Mar 12, 2026Carrier listing: UnitedHealthcare (UMR)

Mar 12, 2026Carrier listing: UnitedHealthcare Colorado

Mar 11, 2026

weight 0.98 · Mar 13, 2026

Matched via: license_number

Colorado License StatusTrust: 0.95

↓DORAweight 0.98 · Mar 13, 2026

Matched via: license_number

Colorado License StatusTrust: 0.95

↓DORA5 records ·weight 0.98 · Latest: Mar 13, 2026

Matched via: license_number

Carrier Network ListingTrust: 0.90

↓FHIR: uhc2 records ·weight 0.90 · Latest: Mar 13, 2026

FHIR Directory StatusTrust: 0.90

↓FHIR: uhc2 records ·weight 0.90 · Latest: Mar 13, 2026

Carrier Network ListingTrust: 0.80

↓TiC: UnitedHealthcare Services5 records ·weight 0.80 · Latest: Mar 12, 2026

Carrier Network ListingTrust: 0.80

↓TiC: UnitedHealthcare Insurance4 records ·weight 0.80 · Latest: Mar 12, 2026

NPI Registration StatusTrust: 0.90

↓NPPES Deactivationweight 0.85 · Mar 12, 2026

Carrier Network ListingTrust: 0.80

↓TiC: UnitedHealthcare (UMR)17 records ·weight 0.80 · Latest: Mar 12, 2026

Carrier Network ListingTrust: 0.80

↓TiC: UnitedHealthcare Coloradoweight 0.80 · Mar 12, 2026

Carrier Network ListingTrust: 0.80

↓TiC: UnitedHealthcare (Surest)3 records ·weight 0.80 · Latest: Mar 11, 2026

Order/Referring EligibilityTrust: 0.95

↓cms_order_referweight 0.95 · Mar 11, 2026

Medicare EnrollmentTrust: 0.95

↓PECOSweight 0.95 · Mar 11, 2026

Practice LocationTrust: 0.80

↓cms_care_compareweight 0.80 · Mar 6, 2026

Carrier Network ListingTrust: 0.80

↓TiC: Kaiser Permanenteweight 0.80 · Mar 5, 2026

Practice LocationTrust: 0.85

↓NPPESweight 0.85 · Mar 5, 2026

Provider SpecialtyTrust: 0.85

↓NPPESweight 0.85 · Mar 5, 2026

entity_typeTrust: 0.85

↓NPPESweight 0.85 · Mar 5, 2026

Carrier listing: UnitedHealthcare (Surest)

Mar 11, 2026Order/Referring Eligibility: record found

Mar 11, 2026Medicare enrollment: Approved

Mar 6, 2026Practice address: LEADVILLE, 80461

Mar 5, 2026Carrier listing: Kaiser Permanente

Mar 5, 2026Practice address: BOULDER, 80304

Mar 5, 2026Provider Specialty: record found

Mar 5, 2026entity_type: record found