CPT 99439: Chronic Care Management Add-On — Each Additional 20 Minutes (2026).
CPT 99439 is the add-on code for each additional 20 minutes of clinical staff time spent on Chronic Care Management beyond the initial 20 minutes billed under 99490. The code can be billed up to 2 times per calendar month for a maximum of 60 total minutes under standard (non-complex) CCM. It cannot be billed standalone — 99490 must also be billed in the same month for the same patient. Each 99439 unit requires a full additional 20 minutes; partial increments do not count.
Quick Answer
What is CPT 99439?
CPT 99439 is the Medicare add-on code for each additional 20 minutes of clinical staff time spent on Chronic Care Management, billed alongside the base 99490 code. It reimburses approximately $50 per 20-minute increment and can be billed up to 2 times per month, capping standard CCM at 60 total minutes per patient per month. 99439 cannot be billed standalone — 99490 must also be billed in the same month for the same patient. Use 99437 instead for complex CCM (99491-based) add-on time.
Documentation
Documentation requirements.
Cumulative time log demonstrating total time exceeded the 20-minute 99490 threshold by each additional 20-minute increment claimed
Detailed activity descriptions for each additional 20-minute block
Confirmation that 99490 was also billed in the same month for the same patient
Updated care plan modifications as applicable
Clinical justification for the extended CCM services
Scenarios
Common billing scenarios.
Standard month with 50 minutes of CCM time
BillableClinical staff spend 50 minutes during the month coordinating care for a patient with diabetes, hypertension, and CKD — reviewing labs, calling the patient about medication adherence, and coordinating with a nephrologist. Bill 99490 (first 20 minutes) and one 99439 unit (additional 20 minutes; the final 10 minutes don't reach a second 99439 increment).
65-minute month — two 99439 units
BillableClinical staff spend 65 minutes managing a patient's chronic conditions during the month, including extensive medication reconciliation after a hospital discharge. Bill 99490 (first 20 minutes) + 2 × 99439 (additional 40 minutes in two 20-min increments). Total CCM revenue for the month is approximately $162.
99439 billed standalone (no 99490)
Not BillableA practice attempts to bill 99439 for a month when the base 99490 threshold of 20 minutes wasn't documented. 99439 is an add-on code — it cannot be billed without 99490 in the same month for the same patient.
Three or more 99439 units in a single month
Not BillableA practice attempts to bill 99490 + 3 × 99439 for an extremely complex patient with 80+ minutes of CCM time. CMS limits 99439 to 2 units per month under standard CCM. If the patient genuinely requires more time, the practice should evaluate whether complex CCM codes (99487/99489) are more appropriate.
FAQ
Common questions about CPT 99439.
What is CPT 99439?
CPT 99439 is the Medicare add-on billing code for each additional 20 minutes of clinical staff time spent on Chronic Care Management beyond the initial 20 minutes billed under 99490. It can be billed up to 2 times per month for a maximum of 60 total minutes under standard CCM. Each unit reimburses approximately $50 under the 2026 Medicare fee schedule.
How much does CPT 99439 reimburse in 2026?
CPT 99439 reimburses approximately $50 per 20-minute increment under the 2026 Medicare Physician Fee Schedule. A patient with 60 minutes of clinical staff CCM time generates approximately $62 (99490) + 2 × $50 (99439) = $162 per month, compared to $62 for a base-only 99490 month.
What is the difference between 99439 and 99437?
Both are CCM add-on codes, but for different base codes. 99439 is the add-on for standard CCM (99490, clinical staff time, 20-min increments). 99437 is the add-on for complex CCM (99491, physician time, 30-min increments). 99439 reimburses ~$50 per unit; 99437 reimburses ~$63 per unit. Use 99439 when the base care is provided by clinical staff; use 99437 when the physician is personally providing complex care management.
Can I bill more than 2 units of 99439 in a single month?
No. CMS limits 99439 to 2 units per patient per calendar month under standard CCM, capping standard CCM time at 60 total minutes (99490 + 2 × 99439). If a patient genuinely requires more clinical staff time, the practice should evaluate whether complex CCM (99487, first 60 minutes; 99489, each additional 30 minutes) is more appropriate.
Does 99439 require a full 20 minutes per unit?
Yes. Each 99439 unit requires a full additional 20 minutes of clinical staff time. Partial increments do not count. For example, 35 minutes total in a month bills 99490 only (20 min) — the 15 additional minutes are not separately reimbursable. Once the 20-min increment is fully reached (40 total minutes), one 99439 unit can be billed.
Can 99439 be billed alongside RPM or BHI?
Yes. 99439 can be billed in the same month as RPM (99454/99457) and BHI (99484) for the same patient, provided the time and clinical activities are distinct and not double-counted. CCM time (99490 + 99439) must focus specifically on chronic medical condition management; RPM time covers device-based monitoring; BHI time covers behavioral health management.
Related Codes
Other CPT codes.
CCM Initial 20 Minutes
$62.00 • Once per calendar month
RPM Device Supply (16+ Days)
$52.11 • Monthly (per 30-day period)
RPM Clinical Review (First 20 Min)
$51.77 • Once per calendar month
RPM Initial Setup (One-Time)
$21.71 • One-time per episode of care
RPM Clinical Review (Additional 20 Min)
$41.42 • Monthly (per calendar month, add-on to 99457)
Complex CCM Initial 30 Minutes
$86.00 • Once per calendar month
PCM Physician Base (30 Min)
$88.00 • Once per calendar month
BHI Care Management (20 Min)
$53.00 • Once per calendar month
CoCM Initial Month (70 Min)
$163.00 • Once per CoCM episode — the initial month only (subsequent months bill 99493)
CoCM Subsequent Month (60 Min)
$130.00 • Monthly, in each month after the initial 99492 month
CoCM Add-On (Each 30 Min)
$66.00 • As needed, in 30-minute increments, in the same month as 99492 or 99493
Complex CCM Add-On (Each 30 Min)
$63.00 • Monthly, as needed, in addition to the base 99491
Sources & Compliance
CPT® notice. CPT is a registered trademark of the American Medical Association. CPT codes, descriptions, and other data only are copyright 2026 American Medical Association. All rights reserved. CPT is provided “as is” without warranty of any kind. The plain-language descriptions, billing scenarios, and FAQs on this page are CCN Health’s editorial summary and are not the official AMA long descriptors.
Reimbursement. Reimbursement figures shown are CCN Health estimates based on the CMS Medicare Physician Fee Schedule (CY 2026) using published RVU values and the 2026 conversion factor of $33.40. Final payment varies by locality (GPCI), facility status, and payer contract. Fee schedules, relative value units, and conversion factors are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use.
Sources. CMS Medicare Physician Fee Schedule, CY 2026 (cms.gov); AMA CPT 2026 Code Set (ama-assn.org).
Disclaimer. This page is informational and does not constitute billing, clinical, or legal advice. Verify all codes, modifiers, and reimbursement amounts against your contracted payer agreements and the official CMS publications before billing.