MR. MARK W WALTER (M.D) – Psychiatry Physician, NPI 1205910643
Psychiatry Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
42 PSYCHIATRY in WY
Provider Addresses for MR. MARK W WALTER (M.D)
501 S Burma Ave
Gillette, WY 827163426
Phone: (307) 688-5000
Fax: (307) 688-5074
Type: Location
1690 ELM ST STE 300
DUBUQUE, IA 520013679
Phone: (563) 690-2850
Fax: (563) 582-5335
Type: Location
Gillette Post Office, 311, South Kendrick Avenue, Gillette, Campbell County, Wyoming, 82716, United States
GILLETTE, WY 827173011
Phone: (307) 688-5000
Fax: (307) 688-5074
Type: Mailing
Campbell County Health, 501, South Burma Avenue, Gillette, Campbell County, Wyoming, 82716, United States
GILLETTE, WY 827163426
Phone: (307) 688-5000
Fax: (307) 688-5074
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
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: 2023-11-07
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 6 Medicare enrollment records; no due dates published yet.
Enrollment records
6
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 |
|---|---|---|---|---|
| I20081031000047 | I | Psychiatry | WY | TBD |
| I20220719002833 | I | Psychiatry | ND | TBD |
| I20221007001256 | I | Psychiatry | MT | TBD |
| I20230802002584 | I | Psychiatry | WI | TBD |
| I20230816002379 | I | Psychiatry | IA | TBD |
| I20231107001579 | I | Psychiatry | MN | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 16 | 11 | $0 |
Insurance plans in this area (ZIP 82716)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| Clinical Social Worker | IA | |
| Nurse Practitioner | IA | |
| - | IA | |
| Nurse Practitioner | WI | |
| Nurse Practitioner | IA | |
| P S Y C H I A T R Y | IL | |
| Internal Medicine | IA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | IA | |
| Nurse Practitioner | IA | |
| - | IA |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.