DR. RYAN LEE RATHJEN (M.D.) – Anesthesiology Physician, NPI 1437245057
Anesthesiology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,169 ANESTHESIOLOGY in CO
Provider Addresses for DR. RYAN LEE RATHJEN (M.D.)
PO BOX 110429
AURORA, CO 800420429
Phone:
Type: Mailing
9395 Crown Crest Blvd
Parker, CO 801388573
Phone: (303) 422-9438
Type: Location
University of Colorado Hospital, 12605, East 16th Avenue, Aurora, Adams County, Colorado, 80045, United States
AURORA, CO 800452545
Phone: (720) 848-0000
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
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Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2014-09-15
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20050519000754 | I | Anesthesiology | NE | TBD |
| I20140915000408 | I | Anesthesiology | CO | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 00811 | Anesthesia for other procedure on large bowel using an endoscope | 61 | 61 | $0 |
| 00731 | Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope | 39 | 39 | $0 |
| 64415 | Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) | 30 | 30 | $0 |
| 01402 | Anesthesia for procedure for total knee joint replacement | 28 | 27 | $0 |
| 36620 | Insertion of artery tube for blood sampling or infusion through skin | 22 | 22 | $0 |
Insurance plans in this area (ZIP 80042)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Certified Registered Nurse Anesthetist (Crna) | NE | |
| A N E S T H E S I O L O G Y | NE | |
| A N E S T H E S I O L O G Y | NE | |
| - | NE | |
| Certified Registered Nurse Anesthetist (Crna) | NE | |
| - | IA | |
| A N E S T H E S I O L O G Y | NE | |
| Certified Registered Nurse Anesthetist (Crna) | IA | |
| A N E S T H E S I O L O G Y | NE | |
| A N E S T H E S I O L O G Y | NE |
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