Mary Louise Chamberlain , PA-C
Physician Assistant โข Denver, CO
4455 E 12th Ave
Denver, CO 802202415
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Mary Chamberlain is listed in NPPES under Physician Assistant.
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NPI assigned on March 5, 2019; this date does not establish years in practice.
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Published CMS data list 25 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99214 โ Established patient outpatient office visit: 25 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See the full table ยท Guide: How to read Medicare Part B data
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Published CMS data list 328 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Quetiapine Fumarate โ 31 prescription fills, including refills.
- Buspirone Hcl โ 29 prescription fills, including refills.
- Trazodone Hcl โ 29 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 17 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 80% of clinicians listed under Physician Assistant in Denver, CO (2024, 170 clinicians with data). Median for this group: 142. Middle half: 37 to 411.
Fewer Medicare Part B services than 90% of clinicians listed under Physician Assistant in Colorado (2024, 1,641 clinicians with data). Median for this group: 195. Middle half: 69 to 517.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 92 in 2021 to 25 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021โ2024.
Practice Location & Contact Primary Location
4455 E 12th Ave
Denver, CO 802202415
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Lg Behavioral Health Of Colorado Llc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
2018
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
21 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $2,846 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Paid by Medicare
About $1,815 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
30-day fills
469 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$7,244 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $414.17 across 18 records.
By nature of payment
- Food and Beverage: $414.17 across 18 records.
Reporting-company totals (3 largest of 8)
- Teva Pharmaceuticals USA, Inc.: $128.97 across 6 records.
- ABBVIE INC.: $70.26 across 3 records.
- Takeda Pharmaceuticals U.S.A., Inc.: $62.92 across 3 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
8 years (graduated 2018)
CMS Doctors and Clinicians data list 2018 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2019
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Mary Chamberlain has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Mary Chamberlain as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Denver and Colorado
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 80% of clinicians listed under Physician Assistant in Denver, CO (2024, 170 clinicians with data). Median for this group: 142. Middle half: 37 to 411.
Fewer Medicare Part B services than 90% of clinicians listed under Physician Assistant in Colorado (2024, 1,641 clinicians with data). Median for this group: 195. Middle half: 69 to 517.
Medicare-allowed amount
A lower Medicare-allowed amount than 75% of clinicians listed under Physician Assistant in Denver, CO (2024, 170 clinicians with data). Median for this group: $12,041. Middle half: $3,439 to $30,647.
A lower Medicare-allowed amount than 85% of clinicians listed under Physician Assistant in Colorado (2024, 1,641 clinicians with data). Median for this group: $15,616. Middle half: $6,273 to $34,912.
Paid by Medicare
A lower Medicare payment amount than 75% of clinicians listed under Physician Assistant in Denver, CO (2024, 170 clinicians with data). Median for this group: $8,764. Middle half: $2,410 to $22,611.
A lower Medicare payment amount than 85% of clinicians listed under Physician Assistant in Colorado (2024, 1,641 clinicians with data). Median for this group: $11,339. Middle half: $4,686 to $25,550.
Medicare Part D prescriptions
More Part D prescriptions than 70% of clinicians listed under Physician Assistant in Denver, CO (2024, 279 clinicians with data). Median for this group: 133. Middle half: 41 to 342.
More Part D prescriptions than 60% of clinicians listed under Physician Assistant in Colorado (2024, 2,034 clinicians with data). Median for this group: 194. Middle half: 63 to 625.
Part D drug cost
A higher Part D drug cost than 60% of clinicians listed under Physician Assistant in Denver, CO (2024, 279 clinicians with data). Median for this group: $2,214. Middle half: $367 to $35,943.
Close to the middle for clinicians listed under Physician Assistant in Colorado (2024, 2,034 clinicians with data). Median for this group: $3,374. Middle half: $574 to $55,951.
540 active clinicians are listed under Physician Assistant with a practice address in Denver, CO (3,767 in Colorado).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Denver
11.9% of these 540 clinicians have the CMS telehealth indicator.
54.1% of these 540 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 73% from 92 in 2021 to 25 in 2024.
- 2021: 92
- 2022: 45
- 2023: 119
- 2024: 25
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Medicare-allowed amount
Medicare-allowed amount decreased 37% from $4,540 in 2021 to $2,846 in 2024.
- 2021: $4,540
- 2022: $4,395
- 2023: $11,211
- 2024: $2,846
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Paid by Medicare
Paid by Medicare decreased 48% from $3,467 in 2021 to $1,815 in 2024.
- 2021: $3,467
- 2022: $3,435
- 2023: $6,900
- 2024: $1,815
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 37% from 239 in 2020 to 328 in 2024.
- 2020: 239
- 2021: 500
- 2022: 800
- 2023: 2,100
- 2024: 328
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30-day fills
30-day fills increased 96% from 239 in 2020 to 469 in 2024.
- 2020: 239
- 2021: 501
- 2022: 904
- 2023: 2,772
- 2024: 469
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Part D drug cost
Part D drug cost increased 62% from $4,471 in 2020 to $7,244 in 2024.
- 2020: $4,471
- 2021: $5,417
- 2022: $18,199
- 2023: $425,437
- 2024: $7,244
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $34.23 in 2021 to $414.17 in 2025.
- 2021: $34.23
- 2022: $97.13
- 2023: $24.47
- 2024: $877.47
- 2025: $414.17
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 โ December 31, 2025): 18 records totaling $414.17.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Neurocrine BioSciences, Inc. |
Food and Beverage
In-kind items and services
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INGREZZA | General | $29.19 |
| Neurocrine BioSciences, Inc. |
Food and Beverage
In-kind items and services
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INGREZZA | General | $28.73 |
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
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COBENFY | General | $28.29 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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INVEGA SUSTENNA | General | $24.70 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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VRAYLAR | General | $24.31 |
| Takeda Pharmaceuticals U.S.A., Inc. |
Food and Beverage
In-kind items and services
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TRINTELLIX | General | $24.26 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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VRAYLAR | General | $24.18 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
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UZEDY | General | $22.93 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
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UZEDY | General | $22.75 |
| Alkermes, Inc. |
Food and Beverage
In-kind items and services
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ARISTADA | General | $22.47 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
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UZEDY | General | $22.38 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
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UZEDY | General | $21.80 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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VRAYLAR | General | $21.77 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
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AUSTEDO XR | General | $19.76 |
| Takeda Pharmaceuticals U.S.A., Inc. |
Food and Beverage
In-kind items and services
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TRINTELLIX | General | $19.37 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
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AUSTEDO XR | General | $19.35 |
| Takeda Pharmaceuticals U.S.A., Inc. |
Food and Beverage
In-kind items and services
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TRINTELLIX | General | $19.29 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
|
CAPLYTA | General | $18.64 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2020โ2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2021โ2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
|
25 | 15 | $441.52 | $113.83 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Quetiapine Fumarate | Quetiapine Fumarate | 31 | 1,358 | $950.73 | 13 |
| Buspirone Hcl | Buspirone Hcl | 29 | 1,330 | $837.13 | โ |
| Trazodone Hcl | Trazodone Hcl | 29 | 845 | $102.55 | โ |
| Aripiprazole | Aripiprazole | 29 | 1,466 | $2,281.30 | 14 |
| Sertraline Hcl | Sertraline Hcl | 27 | 1,397 | $114.64 | 12 |
| Bupropion Xl | Bupropion Hcl | 22 | 1,060 | $427.07 | 12 |
| Olanzapine | Olanzapine | 21 | 993 | $345.11 | โ |
| Risperidone | Risperidone | 19 | 553 | $244.16 | โ |
| Mirtazapine | Mirtazapine | 16 | 480 | $158.25 | โ |
| Clonazepam | Clonazepam | 15 | 450 | $225.27 | โ |
| Venlafaxine Hcl Er | Venlafaxine Hcl | 15 | 450 | $132.12 | โ |
| Fluoxetine Hcl | Fluoxetine Hcl | 14 | 420 | $73.69 | โ |
| Haloperidol | Haloperidol | 13 | 557 | $366.98 | โ |
| Lamotrigine | Lamotrigine | 13 | 834 | $137.52 | โ |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 12 | 570 | $419.92 | โ |
| Prazosin Hcl | Prazosin Hcl | 12 | 600 | $321.38 | โ |
| Lithium Carbonate Er | Lithium Carbonate | 11 | 370 | $105.70 | โ |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2022-02-28NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20220422002418
CO
7012259575
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Lg Behavioral Health Of Colorado Llc
6950 E Belleview Ave, Greenwood Village, CO 801111629
Phone: 3034688018
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Psychiatry & Neurology - Psychiatry
Social Worker - Clinical
Licensed Clinical Social Worker
Social Worker - Clinical
Master of Social Work, Licensed Clinical Social Worker
Psychiatry & Neurology - Psychiatry
Doctor of Medicine (M.D.)
Psychiatry & Neurology - Psychiatry
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 4455 E 12TH AVE, DENVER, CO 802202415 (Tel: 3035047700)
Registered at 4455 E 12TH AVE, DENVER, CO 802202415 (Tel: 3035046500)
Registered at PO BOX 19401, BIRMINGHAM, AL 352199401
NPI status registered as active in NPPES database
Registered at 333 BUSINESS CIR, PELHAM, AL 351241778 (Tel: 2052553828)
Registered at 729 ROCKFORD CIR, BIRMINGHAM, AL 352093155 (Tel: 2567241240)
Recorded as MARY CHAMBERLAIN, PA-C
Physician Assistant (license number reported to NPPES: AL PA.1433)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Denver
- Leah Guy, PA-C
- Taylor Douthitt
- Sarah Gordon, PA-C
- Kristin Brogan
- Ryan Fallt, PA-C
- Julia Balderson, PA
Mailing Address
4455 E 12th Ave
Denver, CO 802202415
Phone: 3035046500