Mary DiehnMD
Family Medicine
2027 Medicare Advantage
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Medicare Advantage plans for Baltimore County, MD.
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Directory results See what each insurance company reports
The 28 Medicare Advantage plans we show for Baltimore County, MD in 2027
- 14 list Mary
- 14 not listed
Alterwood Advantage
5 plans list Mary.
Alterwood Advantage Freedom (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1040 Park Ave, Ste 200, Baltimore, MD, 21201
This result applies to these offices. Other locations are not confirmed.
$0a monthAlterwood Advantage Select (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1040 Park Ave, Ste 200, Baltimore, MD, 21201
This result applies to these offices. Other locations are not confirmed.
$0a monthAlterwood Advantage Choice (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1040 Park Ave, Ste 200, Baltimore, MD, 21201
This result applies to these offices. Other locations are not confirmed.
$35a monthAlterwood Advantage Dual Secure (HMO D-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1040 Park Ave, Ste 200, Baltimore, MD, 21201
This result applies to these offices. Other locations are not confirmed.
$0a month
HealthSpring
4 plans list Mary.
HealthSpring Courage (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 9 Schilling Rd, Ste 102, Hunt Valley, MD, 21031
This result applies to these offices. Other locations are not confirmed.
$0a monthHealthSpring Preferred Plus (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 9 Schilling Rd, Ste 102, Hunt Valley, MD, 21031
This result applies to these offices. Other locations are not confirmed.
$38a monthHealthSpring TotalCare Plus (HMO D-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 9 Schilling Rd, Ste 102, Hunt Valley, MD, 21031
This result applies to these offices. Other locations are not confirmed.
$7.90a monthHealthSpring Achieve (HMO C-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 9 Schilling Rd, Ste 102, Hunt Valley, MD, 21031
This result applies to these offices. Other locations are not confirmed.
$65a month
Johns Hopkins Advantage MD
3 plans list Mary; not listed on 2 other plans.
Johns Hopkins Advantage MD (PPO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1040 Park Ave, Ste 200, Baltimore, MD, 21201
This result applies to these offices. Other locations are not confirmed.
$95a monthJohns Hopkins Advantage MD Plus (PPO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1040 Park Ave, Ste 200, Baltimore, MD, 21201
This result applies to these offices. Other locations are not confirmed.
$165a monthJohns Hopkins Advantage MD D-SNP (HMO D-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1040 Park Ave, Ste 200, Baltimore, MD, 21201
This result applies to these offices. Other locations are not confirmed.
$7.90a month
CareFirst BlueCross BlueShield Advantage DualPrime · CareFirst BlueCross BlueShield Medicare Advantage
1 plan lists Mary; not listed on 3 other plans.
CareFirst BlueCross BlueShield Advantage DualPrime (HMO D-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1040 Park Ave, Ste 200, Baltimore, MD, 21201
This result applies to these offices. Other locations are not confirmed.
$5.70a month
KeyCare Advantage
1 plan lists Mary.
KeyCare Advantage Plus (HMO C-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 63 E Padonia Rd, Ste 125, Lutherville Timonium, MD, 21093
- 9 Schilling Rd, Ste 102, Hunt Valley, MD, 21031
This result applies to these offices. Other locations are not confirmed.
$0a month
Humana
Not listed on its 2 plans here. That isn't proof they're out of network.
Kaiser Permanente
Not listed on its 5 plans here. That isn't proof they're out of network.
UnitedHealthcare
Not listed on its 2 plans here. That isn't proof they're out of network.
Premiums are each plan's own monthly premium, as filed with Medicare. You keep paying your Medicare Part B premium.
Can't find your plan?Tell us the plan you have, and a licensed Silverpath advisor will check whether Mary takes it. Free.
Original Medicare
Original Medicare status
Most Medicare Supplement (Medigap) policies have no provider network: they help pay Original Medicare's cost sharing where Medicare is accepted. Medicare SELECT policies can require network providers for full benefits. Ask the office whether they accept Medicare.
Medicare enrollment and assignment have not been verified here. Advantage directory results do not answer this question.
No opt-out record in this CMS file. CMS's file covers data through 2026-08-31. This does not establish Medicare enrollment, assignment, or whether the office accepts new Medicare patients.
CMS opt-out source · Data through 2026-08-31 · Reviewed Oct 25, 2026
Where they practice
Practice location
9000 Franklin Square Dr, Department of Family Medicine
Baltimore, MD 21237
- NPI issued
- 2013
- Registry record updated
- Sep 6, 2022
Medicare's clinician details aren't available on this page yet.
Questions
Common questions
Which 2027 Medicare Advantage plans list Mary Diehn?
In Baltimore County, MD, 14 Medicare Advantage plans for 2027 list Mary in provider data from Medicare.gov or the carrier, including Alterwood Advantage Freedom (HMO), Alterwood Advantage Select (HMO) and Alterwood Advantage Choice (HMO). CMS matches apply to the covered offices shown with each plan; other offices are not confirmed. Networks can change during the year, so confirm with the office or the plan before you enroll.
Does Mary Diehn take Alterwood Advantage Medicare Advantage plans?
Medicare.gov provider data lists Mary on 5 Medicare Advantage plans for 2027 in Baltimore County, MD, including Alterwood Advantage Freedom (HMO) and Alterwood Advantage Select (HMO). CMS matches apply to the covered offices shown with each plan; other offices are not confirmed. Confirm with the office or Alterwood Advantage before you enroll.
Does Mary Diehn take HealthSpring Medicare Advantage plans?
Medicare.gov provider data lists Mary on 4 Medicare Advantage plans for 2027 in Baltimore County, MD, including HealthSpring Courage (HMO) and HealthSpring Preferred Plus (HMO). CMS matches apply to the covered offices shown with each plan; other offices are not confirmed. Confirm with the office or HealthSpring before you enroll.
Does Mary Diehn take Johns Hopkins Advantage MD Medicare Advantage plans?
Medicare.gov provider data lists Mary on 3 Medicare Advantage plans for 2027 in Baltimore County, MD, including Johns Hopkins Advantage MD (PPO) and Johns Hopkins Advantage MD Plus (PPO). 2 other plans did not return a listing in the search area. CMS matches apply to the covered offices shown with each plan; other offices are not confirmed. Confirm with the office or Johns Hopkins Advantage MD before you enroll.
Where does Mary Diehn practice?
9000 Franklin Square Dr, Department of Family Medicine, Baltimore, MD 21237.
How do I confirm Mary is in my plan's network?
Call the member services number on your plan card and give them the NPI 1780029777, or ask a Silverpath advisor to check for you. It's free.
For providers
Is this your practice?
What patients see here today:
- Provider searches did not return a listing for Mary Diehn on 9 plans from Humana, Kaiser Permanente and UnitedHealthcare in Baltimore County, MD. Other offices are not confirmed; this isn't proof the practice is out of network.
Tell us which plans you take, or want to take, and we'll keep this page accurate and talk with you about reaching more Medicare patients and carriers.