CPT 99421: Online Digital Evaluation for Established Patients (5–10 min)

Medicare pays $16 and commercial payers pay $19 on average nationally for this procedure.

CPT code 99421 describes an online digital evaluation and management service for an established patient, where a physician or other qualified healthcare professional uses secure online communication technologies to discuss a health issue and possible treatment or management; this code covers 5–10 minutes of cumulative clinician time over a 7-day period. The service type is online digital E/M (asynchronous electronic communication) and the typical site of service is telehealth/virtual care delivered remotely via secure messaging or web-based portals, supporting ongoing patient management without an in-person visit.

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National Reimbursement Benchmarks

Commercial average BUCA has a higher mean than Medicare: BUCA’s mean is $18.9 versus Medicare’s mean of $16.1, leaving a $2.8 gap with BUCA paying more on average for CPT 99421. Blue Cross Blue Shield and UnitedHealth Group also have above-Medicare means ($17.2 and $22.3 respectively), while Aetna and Cigna sit on either side of Medicare’s mean.

Dispersion (P75 minus P25) highlights variability across payers: Aetna’s spread is $7.4, Blue Cross Blue Shield’s is $6.2, BUCA’s is $8.7, Cigna’s is $13.1, and UnitedHealth Group’s is $12.9. Cigna shows the widest dispersion at $13.1, indicating the largest spread between its 25th and 75th percentiles, while Blue Cross Blue Shield is the tightest at $6.2.

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CPT 99421: Online Digital Evaluation for Established Patients (5–10 min)

Medicare pays $16 and commercial payers pay $19 on average nationally for this procedure.

Customize your policy alerts

Sign up for cpt 99421 policy alerts

Get alerted when payer policies referencing 99421 are released or updated.

Monitor payer policy activity

Receive email alerts as soon as relevant payer policies are published or updated.

National Reimbursement Benchmarks

National Payer Mean Reimbursement Rates

Clinical & Coding Specifications

Clinical Context

A 45-year-old established patient contacts their primary care clinician through a secure patient portal describing new onset mild intermittent headaches and asking whether an OTC analgesic and watchful waiting are appropriate. The clinician (family medicine or internal medicine) reviews the message, the patient’s chart and recent vitals, exchanges clarifying messages, and documents 5–10 minutes of cumulative time over a seven-day period addressing treatment options and self-care. The interaction does not include a face-to-face visit, does not result in a new diagnosis beyond reassurance, and is coded as 99421. Typical workflow: initial patient message received by portal -> clinician reviews chart and prior notes -> clinician composes and sends clinical response with plan and follow-up instructions -> time is tallied cumulatively for the seven-day episode and documented in the medical record. Typical site of service is remote/virtual (office-based clinician using secure online digital communication). Typical providers are Family Medicine, Internal Medicine, or Neurology clinicians managing established patients for non–face-to-face evaluation and management. Common scenarios include medication refill clarifications, guidance for minor new symptoms where in-person evaluation is not immediately required, and administrative/clearance questions that can be resolved through brief online interaction.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99422`	Online digital evaluation and management service, for an established patient, 11–20 minutes of cumulative time during a 7‑day period	Represents the next time increment if cumulative digital E/M time reaches 11–20 minutes during the 7‑day episode; bill instead of `99421` when time threshold met
`99423`	Online digital evaluation and management service, for an established patient, 21 or more minutes of cumulative time during a 7‑day period	Represents the higher time increment when cumulative digital E/M time reaches 21+ minutes during the 7‑day episode; bill instead of `99421` when time threshold met

Related Modifiers

5 rows

Modifier	Description	When to Use
25	CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…	- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…
52	Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…	- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
59	Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…	- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
95	Modifier 95 indicates that a service was provided via synchronous, real‑time audio‑video telehealth rather than in‑person. Per CMS, AAPC and professional associations, append modifier 95 to claim…	- Use modifier 95 to indicate a service was furnished via synchronous, real‑time audiovisual telehealth (a live audio‑video conference between patient and provider) rather than in‑person. - Pair…
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Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207Q00000X	Family Medicine Physician	Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadt…
207R00000X	Internal Medicine Physician	A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults…
207N00000X	Dermatology Physician	A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genital…
2251C2600X	Cardiopulmonary Physical Therapist	A licensed physical therapist, including but not limited to an individual who is a Board Certified Specialist in Cardiovascular & Pulmonary Physical T…
224ZL0004X	Low Vision Occupational Therapy Assistant	Occupational therapy assistants contribute to the completion of an individualized occupational therapy low-vision evaluation under the direction and s…
2086S0102X	Surgical Critical Care Physician	A surgeon with expertise in the management of the critically ill and postoperative patient, particularly the trauma victim, who specializes in critica…
3336M0002X	Mail Order Pharmacy	A pharmacy where pharmacists compound or dispense prescriptions or other medications in accordance with federal and state law, using common carriers t…
2080P0208X	Pediatric Infectious Diseases Physician	A pediatrician trained to care for children in the diagnosis, treatment and prevention of infectious diseases. This specialist can apply specific know…

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

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Clinical & Coding Specifications

Clinical Context

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99422`	Online digital evaluation and management service, for an established patient, 11–20 minutes of cumulative time during a 7‑day period	Represents the next time increment if cumulative digital E/M time reaches 11–20 minutes during the 7‑day episode; bill instead of `99421` when time threshold met
`99423`	Online digital evaluation and management service, for an established patient, 21 or more minutes of cumulative time during a 7‑day period	Represents the higher time increment when cumulative digital E/M time reaches 21+ minutes during the 7‑day episode; bill instead of `99421` when time threshold met

Related Modifiers

5 rows

Modifier	Description	When to Use
25	CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…	- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…
52	Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…	- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
59	Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…	- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
95	Modifier 95 indicates that a service was provided via synchronous, real‑time audio‑video telehealth rather than in‑person. Per CMS, AAPC and professional associations, append modifier 95 to claim…	- Use modifier 95 to indicate a service was furnished via synchronous, real‑time audiovisual telehealth (a live audio‑video conference between patient and provider) rather than in‑person. - Pair…
[object Object]

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207Q00000X	Family Medicine Physician	Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadt…
207R00000X	Internal Medicine Physician	A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults…
207N00000X	Dermatology Physician	A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genital…
2251C2600X	Cardiopulmonary Physical Therapist	A licensed physical therapist, including but not limited to an individual who is a Board Certified Specialist in Cardiovascular & Pulmonary Physical T…
224ZL0004X	Low Vision Occupational Therapy Assistant	Occupational therapy assistants contribute to the completion of an individualized occupational therapy low-vision evaluation under the direction and s…
2086S0102X	Surgical Critical Care Physician	A surgeon with expertise in the management of the critically ill and postoperative patient, particularly the trauma victim, who specializes in critica…
3336M0002X	Mail Order Pharmacy	A pharmacy where pharmacists compound or dispense prescriptions or other medications in accordance with federal and state law, using common carriers t…
2080P0208X	Pediatric Infectious Diseases Physician	A pediatrician trained to care for children in the diagnosis, treatment and prevention of infectious diseases. This specialist can apply specific know…

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

CPT 99421: Online Digital Evaluation for Established Patients (5–10 min)

Sign up for cpt 99421 policy alerts

National Reimbursement Benchmarks

CPT 99421: Online Digital Evaluation for Established Patients (5–10 min)

Sign up for cpt 99421 policy alerts

National Reimbursement Benchmarks

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

What clinical scenario does CPT 99421 cover?

How does 99421 relate to other online digital E/M codes like 99422 and 99423?

Which specialties and sites of service typically use 99421?

What does the reimbursement benchmark data tell me about payment variability for 99421?

Which billing modifiers might apply to 99421 and where can I find rules for using them?

References

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

What clinical scenario does CPT 99421 cover?

How does 99421 relate to other online digital E/M codes like 99422 and 99423?

Which specialties and sites of service typically use 99421?

What does the reimbursement benchmark data tell me about payment variability for 99421?

Which billing modifiers might apply to 99421 and where can I find rules for using them?

References