MR. MARK MICHAEL CHUNG (MD) – Internal Medicine Physician, NPI 1740290378
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,780 PULMONARY DISEASE in CA
Provider Addresses for MR. MARK MICHAEL CHUNG (MD)
P.O. BOX 5279
LOS ALAMITOS, CA 90721
Phone: (562) 598-1002
Fax: (562) 799-0115
Type: Mailing
11821 SOUTH ST
CERRITOS, CA 907036825
Phone: (562) 991-5679
Fax: (562) 991-5681
Type: Location
3791, Katella Avenue, Los Alamitos, Orange County, California, 90720, United States
#103
LOS ALAMITOS, CA 90720
Phone: (562) 598-1002
Fax: (562) 799-0115
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 56 Open Payments records for all available years, with a total value of $1,623.
Total Amount is formed as General ($1,623) + Research ($0) + Ownership ($0) = $1,623.
Last reported payment date: 2024-12-19 • Largest payer in this snapshot: GlaxoSmithKline, LLC. ($1,168).
Total Amount
$1,623
General + Research + Ownership
Payments
56
Total payment records
General Amount
$1,623
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GlaxoSmithKline, LLC. | $1,168 |
| AstraZeneca Pharmaceuticals LP | $428 |
| Regeneron Healthcare Solutions, Inc. | $27 |
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: 2010-09-28
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
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 |
|---|---|---|---|---|
| I20100928000232 | I | Pulmonary Disease | CA | 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 |
|---|---|---|---|---|
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 376 | 131 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 137 | 64 | $0 |
| 99205 | New patient office or other outpatient visit, 60-74 minutes | 25 | 25 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 13 | 12 | $0 |
Insurance plans in this area (ZIP 90721)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| PULMONARY DISEASE | CA | 95811 | Sleep monitoring of patient (6 years or older) in sleep lab with continued pressured respiratory assistance by mask or breathing tube | 18 | 17 |
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